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1 is 1.

It is by definition not prime, and it's obviously not composite. This is not a paradox, it's just a consequence of how primes are defined.

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8y ago

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It is neither. The classification into prime or composite is defined only for integers which are 2 or larger.

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8y ago
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It has a special status: it is the identity element of multiplication.

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7y ago
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Q: What number is 1 if not prime or composite?
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