It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 522 518 is not a prime number.
For example, 522 518 can be divided by 2: 522 518 / 2 = 261 259.
For 522 518 to be a prime number, it would have been required that 522 518 has only two divisors, i.e., itself and 1.
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522 518 is an even number, because it is evenly divisible by 2: 522 518 / 2 = 261 259.
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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 522 518 is about 722.854.
Thus, the square root of 522 518 is not an integer, and therefore 522 518 is not a square number.
The square of a number (here 522 518) is the result of the product of this number (522 518) by itself (i.e., 522 518 × 522 518); the square of 522 518 is sometimes called "raising 522 518 to the power 2", or "522 518 squared".
The square of 522 518 is 273 025 060 324 because 522 518 × 522 518 = 522 5182 = 273 025 060 324.
As a consequence, 522 518 is the square root of 273 025 060 324.
The multiples of 522 518 are all integers evenly divisible by 522 518, that is all numbers such that the remainder of the division by 522 518 is zero. There are infinitely many multiples of 522 518. The smallest multiples of 522 518 are: