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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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Explain what a prime number is?

A prime number has no factors except itself and 1.


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A prime number has exactly two factors, 1 and the number itself. 1 is not a prime number, and the product will be a composite number if any other prime is used as a factor and multiplied by another prime.


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