Quote:
Originally Posted by Jeff Root
It is clear to me that the number 'one' is a prime number (since it is
not the product of other integers), but for convenience in certain cases
in number theory, an ad hoc addition was made to the definition to
specify that it is 'not a prime'. By nature, it is prime. By definition,
it is not prime.
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But I think there are two reasonable ways to define a prime. One is a number that can only be divided by 1 and itself. The other definition could be a number that can be divided by exactly two numbers, 1 and itself. By the first definition, 1 is in, in the second definition, it is out.