It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 518 687 is not a prime number.
For example, 8 518 687 can be divided by 43: 8 518 687 / 43 = 198 109.
For 8 518 687 to be a prime number, it would have been required that 8 518 687 has only two divisors, i.e., itself and 1.
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8 518 687 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 8 518 687 is about 2 918.679.
Thus, the square root of 8 518 687 is not an integer, and therefore 8 518 687 is not a square number.
The square of a number (here 8 518 687) is the result of the product of this number (8 518 687) by itself (i.e., 8 518 687 × 8 518 687); the square of 8 518 687 is sometimes called "raising 8 518 687 to the power 2", or "8 518 687 squared".
The square of 8 518 687 is 72 568 028 203 969 because 8 518 687 × 8 518 687 = 8 518 6872 = 72 568 028 203 969.
As a consequence, 8 518 687 is the square root of 72 568 028 203 969.
The multiples of 8 518 687 are all integers evenly divisible by 8 518 687, that is all numbers such that the remainder of the division by 8 518 687 is zero. There are infinitely many multiples of 8 518 687. The smallest multiples of 8 518 687 are: