1*31
It is a Prime number
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31 has no prime factors because it is a prime number so it has two factors, 1 and 31.
31 is a prime number because it has only two factors which are itself and one
31 and 41 are prime numbers because they have only two factors
A prime number can only have two factors, 1 and itself. 713 has two other factors, 23 and 31, so is not prime.
It is 31 because it has only two factors which are itself and one