31 is a Prime number because it has only two factors which are itself and one
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31 and 61 are prime, the rest composite.
31 is a prime number because it has only two factors which are itself and one
Yes it is, The only divisors of 31 are 1 and 31 so it is prime.Yes.31 is prime, yes
1891 is not prime. 1891 = 31 * 61
155 is not a prime number, but a composite number, as it is divisible by 5 and 31.