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1 is neither a prime, nor a composite number. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

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12y ago
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10y ago

One is a multiple and a factor.

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8y ago

Because it isn't a prime number.

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Q: Why isn't 1 a prime factor?
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