Why is 11 not a prime number?

Why is 1 not considered a prime number?

Or, why is the definition of prime numbers given for integers greater than 1?


One of the whole “points” of defining primes is to be able to uniquely and finitely prime factorize every natural number.

If 1 was prime, then this would be more or less impossible.

Source : Link , Question Author : bryn , Answer Author : Justin L.

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