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Prime and Composite Numbers < you are here
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Prime vs. Composite Numbers
 Factors: Factors are numbers that are multiplied to get a product.  In the multiplication sentence 3X7=21, the factors of 21 are 3 and 7.
 Prime numbers: Numbers that have only 2 factors, 1 and itself, are called prime numbers. Example: the number 5 is a prime number. You can not divide 5 evenly by 2, 3, or 4. You can only divide 5 evenly by 1 or itself.
Prime and Composite Numbers
 Composite numbers: Numbers that have more than 2 factors are called composite numbers. The number 6 is an example of a composite number.You can divide six evenly by 1, 2, 3, and 6
Note: 1 is neither a prime number or a composite number.
The chart below shows some examples of prime and composite
numbers.
The prime numbers are blue. The composite numbers are
black.
Any whole number except 1 is either Prime or Composite.
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