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1 is neither prime nor composite because there is only one set of multiples to receive 1, as opposed to 2 which is prime because there are two sets of multiples to receive 2, 2 X 1 and 1 X 2. To be prime there can only be two sets of multiples to receive the number, and for composite there has to be more than two.

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Q: Is 1 a prime number explain why?
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