It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 504 is not a prime number.
For example, 520 504 can be divided by 2: 520 504 / 2 = 260 252.
For 520 504 to be a prime number, it would have been required that 520 504 has only two divisors, i.e., itself and 1.
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520 504 is an even number, because it is evenly divisible by 2: 520 504 / 2 = 260 252.
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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 520 504 is about 721.460.
Thus, the square root of 520 504 is not an integer, and therefore 520 504 is not a square number.
The square of a number (here 520 504) is the result of the product of this number (520 504) by itself (i.e., 520 504 × 520 504); the square of 520 504 is sometimes called "raising 520 504 to the power 2", or "520 504 squared".
The square of 520 504 is 270 924 414 016 because 520 504 × 520 504 = 520 5042 = 270 924 414 016.
As a consequence, 520 504 is the square root of 270 924 414 016.
The multiples of 520 504 are all integers evenly divisible by 520 504, that is all numbers such that the remainder of the division by 520 504 is zero. There are infinitely many multiples of 520 504. The smallest multiples of 520 504 are: