# Is 21387 a prime number?

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

No, 21 387 is not a prime number.

For example, 21 387 can be divided by 3: 21 387 / 3 = 7 129.

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For 21 387 to be a prime number, it would have been required that 21 387 has only two divisors, i.e., itself and 1.

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