It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 521 518 is not a prime number.
For example, 521 518 can be divided by 2: 521 518 / 2 = 260 759.
For 521 518 to be a prime number, it would have been required that 521 518 has only two divisors, i.e., itself and 1.
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521 518 is an even number, because it is evenly divisible by 2: 521 518 / 2 = 260 759.
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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 521 518 is about 722.162.
Thus, the square root of 521 518 is not an integer, and therefore 521 518 is not a square number.
The square of a number (here 521 518) is the result of the product of this number (521 518) by itself (i.e., 521 518 × 521 518); the square of 521 518 is sometimes called "raising 521 518 to the power 2", or "521 518 squared".
The square of 521 518 is 271 981 024 324 because 521 518 × 521 518 = 521 5182 = 271 981 024 324.
As a consequence, 521 518 is the square root of 271 981 024 324.
The multiples of 521 518 are all integers evenly divisible by 521 518, that is all numbers such that the remainder of the division by 521 518 is zero. There are infinitely many multiples of 521 518. The smallest multiples of 521 518 are: