How to identify whole numbers that are prime or composite

How to identify whole numbers that are prime or composite example

Identifying whole numbers that are prime or composite numbers is simple, just follow the how to identify whole numbers that are prime or composite steps.

Is 13 a composite number?

• Divide 13 by 2 - you will find that 13 is not divisible by 2.
• Divide 13 by 3 - you will find that 13 is not divisible by 3.
• Divide 13 by 5 - you will find that 13 is not divisible by 5.
• Divide 13 by 7 - you will find that 13 is not divisible by 7.
• Divide 13 by 11 - you will find that 13 is not divisible by 11.
• Divide 13 by 13 - you will find that 13 divided by 13 gives 1.

That means 13 is only divisible by 1 and itself. Therefore, 13 is a prime number.

Is 25 a composite number?

• Divide 25 by 2 - you will find that 25 is not divisible by 2.
• Divide 25 by 3 - you will find that 25 is not divisible by 3.
• Divide 25 by 5 - you will find that 25 divided by 5 equals 5.

That means at least 1, 5, and 25 are factors of 25. 25 is therefore not a prime number. 25 is therefore a composite number.