It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 531 is not a prime number.
For example, 520 531 can be divided by 11: 520 531 / 11 = 47 321.
For 520 531 to be a prime number, it would have been required that 520 531 has only two divisors, i.e., itself and 1.
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520 531 is an odd number, because it is not evenly divisible by 2.
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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 520 531 is about 721.478.
Thus, the square root of 520 531 is not an integer, and therefore 520 531 is not a square number.
The square of a number (here 520 531) is the result of the product of this number (520 531) by itself (i.e., 520 531 × 520 531); the square of 520 531 is sometimes called "raising 520 531 to the power 2", or "520 531 squared".
The square of 520 531 is 270 952 521 961 because 520 531 × 520 531 = 520 5312 = 270 952 521 961.
As a consequence, 520 531 is the square root of 270 952 521 961.
The multiples of 520 531 are all integers evenly divisible by 520 531, that is all numbers such that the remainder of the division by 520 531 is zero. There are infinitely many multiples of 520 531. The smallest multiples of 520 531 are: