It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 371 is not a prime number.
For example, 518 371 can be divided by 7: 518 371 / 7 = 74 053.
For 518 371 to be a prime number, it would have been required that 518 371 has only two divisors, i.e., itself and 1.
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518 371 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 518 371 is about 719.980.
Thus, the square root of 518 371 is not an integer, and therefore 518 371 is not a square number.
The square of a number (here 518 371) is the result of the product of this number (518 371) by itself (i.e., 518 371 × 518 371); the square of 518 371 is sometimes called "raising 518 371 to the power 2", or "518 371 squared".
The square of 518 371 is 268 708 493 641 because 518 371 × 518 371 = 518 3712 = 268 708 493 641.
As a consequence, 518 371 is the square root of 268 708 493 641.
The multiples of 518 371 are all integers evenly divisible by 518 371, that is all numbers such that the remainder of the division by 518 371 is zero. There are infinitely many multiples of 518 371. The smallest multiples of 518 371 are: