Composite Numbers in Real-World Problem Solving: From Practical Math to Scientific Research

Table of Contents

What is a Composite Number?

The term “Composite number” refers to any number that combines more than two factors.  Prime numbers, which only include the number and the number one as factors, are the opposite of composite numbers. Because it can be divided by more than two other numbers, every natural number that is not a prime is a composite number.  

For Example:

Factors of 4:  1, 2, and 4.

Four number is a composite number since it comprises three components.

6’s  factors are 1, 2, 3, and 6. Six is also a composite number because it has more than two factors.

List of Composite Numbers from 1 to 100

The Difference Between Composite & Prime Numbers

Composite Numbers And Their Properties

Properties of Composite Number

  • Composite numbers have more than two factors. 
  • Every composite number has itself as a factor. 
  • The smallest composite number is 4.
  • Composite numbers can also be divided by other composite numbers.
  • Even division of composite numbers by their factors is possible.

Types of Composite Number

There are two types of composite numbers

1. Composite Odd Numbers 

Composite numbers that are odd in nature are called odd composite numbers. Examples are 9, 15, 21, etc. 

2. Composite Even Numbers

Composite numbers that are even in nature are called even composite numbers. Examples are 4, 6, 8, etc. 

What are the Common Factors that Cause a Number to be Composite?

Composite numbers are those with three or more factors, including the number itself, the number 1, and any additional factor. 

Such as 8’s factors = 1, 2, 4, 8

What are the Rules for Finding Factors of Composite Numbers?

We only need to count the number of its factors to determine whether a particular number is composite. The number is composite if there are more than two contributing factors. The factors 1, 2, and 4 are present in the number 4, for instance. As a result, it is a composite number. 

What are the Rules for Finding Factors of Composite Numbers?

The biggest positive number that divides evenly into all the numbers in a group of whole numbers without leaving any residue is the group’s greatest common factor.  

For instance, to determine the GCF of the numbers 18 and 27, 

18’s factors: 1, 2, 3, 6, 9 and 18.

27’s factors: 1, 3, 9, and 27. 

1, 3, and 9 are the common factors of 18 and 27. 

The greatest common factor between 18 and 27 is 9.

How to Calculate the Least Common Multiple for Composite Numbers

  • Step 1: List the initial few multiples of each number.  
  • Step 2: Locate duplicates that show up on both lists. 
  • Step 3: Find the number that appears the fewest times on both lists. 
  • Step 4: The LCM is this number. 


A common multiple of two numbers is a number that is a multiple of both numbers. Let’s imagine we’re searching for often occurring multiples of 10 and 25. 

10, 20, 30, 40, 50, 60, and 70 are multiples of 10. 

25, 50, 75, and 100 are multiples of 25. 

The least common multiple (LCM) is the smallest number which is a multiple of two numbers (LCM). Consequently, the lowest LCM for 10 and 25 is 50.

How to Find Out if a Number is Prime or Composite?

How can you detect whether a number is composite or prime? 

Look at what qualifies a number as “prime” first. A prime number is one whose two factors are both 1 and the number itself.  

Whenever there are more than two factors, the number is composite. 

Let’s use an illustration to assist you to grasp this: 

Identify whether the number 27 is composite or prime.

As 27 is an odd number, let’s see if 27 can be divided by 3. 

27 = 3 x 3 x 3 

27 is divided by = 1, 3, 9, and 27, which is more than two numbers.

Therefore, 27 is a composite number. 

The Importance of Composite Numbers in Mathematics

One of the most important and fundamental ideas in mathematics is the concept of composite numbers as they make up for a large chunk of the numbers in the number system. Composite numbers help students think more critically and imaginatively. Students will be able to compute more quickly and apply these ideas to their everyday lives by using composite numbers. 


A key idea in mathematics is the concept of composite numbers. Worksheets and workbooks, practice papers, quizzes, and puzzles, are available to assist students at {} 

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