Q:

# Is 63 a prime number?

A:

Sixty-three is not a prime number. Sixty-three is classified as a composite number because it has divisors, and can be composed of other numbers than number one.

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Numbers are identified as either prime or composite numbers, with the exception of one. To be classified as a prime number, a number must be greater than one and only divisible by one and itself.

Sixty-three, however, is not a prime number. It is divisible by the following multiple numbers: 1, 3, 9, 7 and 21.

All composite numbers, like 63, have prime divisors. The prime divisors of 63 are 3 and 7.

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