It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 331 is not a prime number.
For example, 520 331 can be divided by 7: 520 331 / 7 = 74 333.
For 520 331 to be a prime number, it would have been required that 520 331 has only two divisors, i.e., itself and 1.
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520 331 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 520 331 is about 721.340.
Thus, the square root of 520 331 is not an integer, and therefore 520 331 is not a square number.
The square of a number (here 520 331) is the result of the product of this number (520 331) by itself (i.e., 520 331 × 520 331); the square of 520 331 is sometimes called "raising 520 331 to the power 2", or "520 331 squared".
The square of 520 331 is 270 744 349 561 because 520 331 × 520 331 = 520 3312 = 270 744 349 561.
As a consequence, 520 331 is the square root of 270 744 349 561.
The multiples of 520 331 are all integers evenly divisible by 520 331, that is all numbers such that the remainder of the division by 520 331 is zero. There are infinitely many multiples of 520 331. The smallest multiples of 520 331 are: