# Is 139840 a prime number?

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

No, 139 840 is not a prime number.

For example, 139 840 can be divided by 2: 139 840 / 2 = 69 920.

Actually, one can immediately see that 139 840 cannot be prime, because 5 is one of its divisors: indeed, a number ending with 0 or 5 has necessarily 5 among its divisors.
The last digit of 139 840 is 0, so it is divisible by 5 and is therefore *not* prime.

For 139 840 to be a prime number, it would have been required that 139 840 has only two divisors, i.e., itself and 1.

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