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Why is 1 excluded as a prime number since it is divisible by 1 and itself?

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2009-10-25 12:23:47
2009-10-25 12:23:47

A Prime number has exactly two factors, which are 1 and itself. The number 1 has only one factor, since 1 and itself are the same number. Therefore, it does not meet the definition of a prime number. It is known as unity. It is neither a composite number nor a prime number.

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