It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 522 is not a prime number.
For example, 520 522 can be divided by 2: 520 522 / 2 = 260 261.
For 520 522 to be a prime number, it would have been required that 520 522 has only two divisors, i.e., itself and 1.
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520 522 is an even number, because it is evenly divisible by 2: 520 522 / 2 = 260 261.
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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 520 522 is about 721.472.
Thus, the square root of 520 522 is not an integer, and therefore 520 522 is not a square number.
The square of a number (here 520 522) is the result of the product of this number (520 522) by itself (i.e., 520 522 × 520 522); the square of 520 522 is sometimes called "raising 520 522 to the power 2", or "520 522 squared".
The square of 520 522 is 270 943 152 484 because 520 522 × 520 522 = 520 5222 = 270 943 152 484.
As a consequence, 520 522 is the square root of 270 943 152 484.
The multiples of 520 522 are all integers evenly divisible by 520 522, that is all numbers such that the remainder of the division by 520 522 is zero. There are infinitely many multiples of 520 522. The smallest multiples of 520 522 are: