A Prime number is a positive whole number (a positive integer) that has exactly two unique positive divisors, 1 and the number itself.
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A prime number is a positive integer that has only two factors: one and itself.
Two number are co-prime if there is no whole number other than 1 that divides them both exactly
Did you mean what Mersenne numbers are prime? If a number is a prime, how is it not a prime at the same time? Anyways, M11, or (2^11) - 1, I think is the lowest Mersenne Number Mp that isn't prime, when p is prime. Any Mersenne Number where p is not prime cannot be prime.
If you mean 4 multiplications of 2 then they are the prime factors of 16 because 2222 is not a prime number
A prime number is a number that can only be equally divided by 2 integers 1 and itself