Question

Why is -1 not a prime?

Answer 1

Answer:

Prime numbers are the building blocks of the number system, which special properties needed for encryption. Primes are positive, whole numbers greater than one that cannot be divided evenly by any other whole number. ... Play Prime not Prime to test your inner math nerd.

Answer 2

Answer:

1 is not a prime number.

Proof: The definition of a prime number is a positive integer that has exactly two positive divisors. However, 1 only has one positive divisor (1 itself), so it is not prime.

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