# Prime Numbers?

what's the exact definition of prime numbers?

is 1 a prime #? how about 2? i know others like 3 ,5,7,11,13 etc are prime numbers,but not sure about 1 and 2.

is 1 a prime #? how about 2? i know others like 3 ,5,7,11,13 etc are prime numbers,but not sure about 1 and 2.

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