Q:

# Is "0" a prime number?

A:

The number zero is not a prime number. By definition, a prime number dictates that the number must be a whole number greater in value than one and must be divisible by only itself and one.

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The value of zero is less than one, so zero does not meet the first criteria of the definition. Zero can be divided by any number, and the answer is always zero. The smallest prime number is two, and it is the only even prime number. With the exception of the numbers two and five, all prime numbers end in 1, 3, 7 or 9.

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