It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 398 is not a prime number.
For example, 520 398 can be divided by 2: 520 398 / 2 = 260 199.
For 520 398 to be a prime number, it would have been required that 520 398 has only two divisors, i.e., itself and 1.
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520 398 is an even number, because it is evenly divisible by 2: 520 398 / 2 = 260 199.
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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 520 398 is about 721.386.
Thus, the square root of 520 398 is not an integer, and therefore 520 398 is not a square number.
The square of a number (here 520 398) is the result of the product of this number (520 398) by itself (i.e., 520 398 × 520 398); the square of 520 398 is sometimes called "raising 520 398 to the power 2", or "520 398 squared".
The square of 520 398 is 270 814 078 404 because 520 398 × 520 398 = 520 3982 = 270 814 078 404.
As a consequence, 520 398 is the square root of 270 814 078 404.
The multiples of 520 398 are all integers evenly divisible by 520 398, that is all numbers such that the remainder of the division by 520 398 is zero. There are infinitely many multiples of 520 398. The smallest multiples of 520 398 are: