It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 516 is not a prime number.
For example, 518 516 can be divided by 2: 518 516 / 2 = 259 258.
For 518 516 to be a prime number, it would have been required that 518 516 has only two divisors, i.e., itself and 1.
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518 516 is an even number, because it is evenly divisible by 2: 518 516 / 2 = 259 258.
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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 518 516 is about 720.081.
Thus, the square root of 518 516 is not an integer, and therefore 518 516 is not a square number.
The square of a number (here 518 516) is the result of the product of this number (518 516) by itself (i.e., 518 516 × 518 516); the square of 518 516 is sometimes called "raising 518 516 to the power 2", or "518 516 squared".
The square of 518 516 is 268 858 842 256 because 518 516 × 518 516 = 518 5162 = 268 858 842 256.
As a consequence, 518 516 is the square root of 268 858 842 256.
The multiples of 518 516 are all integers evenly divisible by 518 516, that is all numbers such that the remainder of the division by 518 516 is zero. There are infinitely many multiples of 518 516. The smallest multiples of 518 516 are: