Common Core Math Vocabulary

Prime Number - Definition with Examples

What are Prime Numbers?

Prime Numbers Definition: The numbers greater than 1 that have only 2 factors; 1 and the number itself are called prime numbers. In other words, prime numbers are numbers that are divisible only by 1 and itself.

For example: 3 is a prime number, as it has only 2 factors: 1 and 3.

Is 7 a Prime Number

8 is not a prime number as it has more than 2 factors: 1, 2, 4, 8. Hence, 8 is a composite number.

 

Composite Numbers:

Composite numbers are natural numbers that have more than 2 factors.

Example: 10 is a composite number, as it has more than 2 factors: 1, 2, 5, 10.

Prime or Composite

 

Facts about Prime Number

Zero and 1 are neither prime nor composite numbers.
2 is the only even prime number.
All natural numbers greater than 1 either prime or composite.

Here is a list of prime numbers and composite numbers between 1-100.

Prime and Composite Number Chart

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