Is 165991 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 991 is not a prime number.
For example, 165 991 can be divided by 7: 165 991 / 7 = 23 713.
For 165 991 to be a prime number, it would have been required that 165 991 has only two divisors, i.e., itself and 1.
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