It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 518 434 is not a prime number.
For example, 8 518 434 can be divided by 2: 8 518 434 / 2 = 4 259 217.
For 8 518 434 to be a prime number, it would have been required that 8 518 434 has only two divisors, i.e., itself and 1.
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8 518 434 is an even number, because it is evenly divisible by 2: 8 518 434 / 2 = 4 259 217.
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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 8 518 434 is about 2 918.636.
Thus, the square root of 8 518 434 is not an integer, and therefore 8 518 434 is not a square number.
The square of a number (here 8 518 434) is the result of the product of this number (8 518 434) by itself (i.e., 8 518 434 × 8 518 434); the square of 8 518 434 is sometimes called "raising 8 518 434 to the power 2", or "8 518 434 squared".
The square of 8 518 434 is 72 563 717 812 356 because 8 518 434 × 8 518 434 = 8 518 4342 = 72 563 717 812 356.
As a consequence, 8 518 434 is the square root of 72 563 717 812 356.
The multiples of 8 518 434 are all integers evenly divisible by 8 518 434, that is all numbers such that the remainder of the division by 8 518 434 is zero. There are infinitely many multiples of 8 518 434. The smallest multiples of 8 518 434 are: