Question

Why -1 is not a prime number??

Answer 1

Prime Number Calculator. Enter a number and the Prime Number Calculator will instantly tell you if it is a prime number or not. Please enter a number: Prime numbersare positive, non-zero numbers that have exactly two factors -- no more, no less.

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Answer 2

Hii...

All prime numbers belong to natural no.

thats why -1 is not prime no.