# Is 80520845 a prime number?

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

No, 80 520 845 is not a prime number.

For example, 80 520 845 can be divided by 5: 80 520 845 / 5 = 16 104 169.

Actually, one can immediately see that 80 520 845 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 80 520 845 is 5, so it is divisible by 5 and is therefore *not* prime.

For 80 520 845 to be a prime number, it would have been required that 80 520 845 has only two divisors, i.e., itself and 1.

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