# Is 3991 a prime number?

It is possible to find out using mathematical methods whether a given integer is a prime number or not.

No, 3 991 is not a prime number.

For example, 3 991 can be divided by 13: 3 991 / 13 = 307.

For 3 991 to be a prime number, it would have been required that 3 991 has only two divisors, i.e., itself and 1.

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