It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 724 is not a prime number.
For example, 520 724 can be divided by 2: 520 724 / 2 = 260 362.
For 520 724 to be a prime number, it would have been required that 520 724 has only two divisors, i.e., itself and 1.
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520 724 is an even number, because it is evenly divisible by 2: 520 724 / 2 = 260 362.
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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 520 724 is about 721.612.
Thus, the square root of 520 724 is not an integer, and therefore 520 724 is not a square number.
The square of a number (here 520 724) is the result of the product of this number (520 724) by itself (i.e., 520 724 × 520 724); the square of 520 724 is sometimes called "raising 520 724 to the power 2", or "520 724 squared".
The square of 520 724 is 271 153 484 176 because 520 724 × 520 724 = 520 7242 = 271 153 484 176.
As a consequence, 520 724 is the square root of 271 153 484 176.
The multiples of 520 724 are all integers evenly divisible by 520 724, that is all numbers such that the remainder of the division by 520 724 is zero. There are infinitely many multiples of 520 724. The smallest multiples of 520 724 are: