# Composite Numbers Definition

In Mathematics, you must have learned about different sets of numbers including **Natural numbers, Whole numbers, **and **Integers.** A specific type of number is called a Composite number that we are going to discuss here on this page.

**Note:**

You can read about Prime numbers**, **Rational numbers and Square numbers here.

All numbers that are made by multiplying **two or more whole numbers **are called “Composite Numbers”. In simple words, a number that has at least two **factors** is called a composite number.

**For example,**

24 is a composite number because it has “4” factors i.e. 2 x 2 x 2 x 3.

So, we can say that a number that is formed by multiplying different prime numbers is called a composite number.

## What is the difference between Prime & Composite Numbers?

To understand composite numbers deeply, you need to know a little about prime numbers. Those numbers that are **not divisible by any other number** are called **Prime numbers**. For example, 3 is a prime number because it is not divisible by any number except 3.

**Note:**

Read about Prime Numbers** **here.

Composite and Prime numbers are opposite to each other in all aspects. A composite number can be formed by multiplying different prime numbers but a prime number can’t be made from composite numbers.

### Types of Composite Numbers

There are two main types of composite numbers in Mathematics.

**Odd Composite Numbers**:

All those composite numbers that have an odd number at their unit places.

**For example,**

9, 15, 21, and 27 are odd composite numbers.

**Note:**

Read about Odd Numbers here.

All those numbers that have even numbers at their unit places.

**For example,**

12, 26, and 36 are even composite numbers.

**Note:**

Read about** ****Even Numbers** here.

### Fun Facts about Composite Numbers

- A composite number has at least 2
- All even numbers are composite except 2.
- Prime numbers can make a composite number while a composite number can’t make a prime number.
- A composite number can be divided by other composite numbers.

### How to check if a number is composite or not?

To check whether a number is composite or prime, you should follow a few steps.

- Divide the given number by prime numbers
- If the number has more than two factors except 1 as it’s divisible, then it will be termed as a composite number.

In simple words, you have to do Prime Factorization of the given number to find all of its factors.

**Note:**

You can learn about **Prime Factorization** here in detail.

### List of Composite Numbers from 1 to 100

### FAQ's

**What is the smallest Composite Number?**

“4” is the smallest composite number.

**Can a number be prime and composite at the same time?**

No, a number can’t be a prime number and a composite number at the same time.

**Is 0 a composite number?**

No, 0 is neither a composite number nor a prime number. It is termed as a whole number only.

**Why 1 is not a composite number?**

1 is not a composite number because it has only one factor which is “1” itself.

**What is the smallest odd composite number?**

The smallest odd composite number is “9”

**How to find factors of a composite number?**

Through prime factorization, we can find factors of a composite number.

**Are all even numbers composite numbers?**

All even numbers are composite numbers except “2”.