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 Depdendent Variable

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 Dependent Variable

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# Prime and Composite Numbers

A prime number has exactly two factors, the number 1 and itself. It is not evenly divisible by any other whole number.

Example:

What are the factors of the number 5?

1 Ã— 5 = 5  The numbers 1 and 5 are the only factors of 5.

Therefore 5 is a prime number.

Any number greater than 1 that is not a prime number is called a composite number. The number 18 is a composite number because it has three factors: 2, 3, 3.

Any whole number greater than 1 can be written as the product of prime number factors. This is called prime factoring. One method of finding the prime factors of a whole number is to make a factor tree. The branches end in prime numbers.

Example:

The number 1 is not a prime number. The smallest prime number is 2.