It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 408 is not a prime number.
For example, 520 408 can be divided by 2: 520 408 / 2 = 260 204.
For 520 408 to be a prime number, it would have been required that 520 408 has only two divisors, i.e., itself and 1.
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520 408 is an even number, because it is evenly divisible by 2: 520 408 / 2 = 260 204.
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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 520 408 is about 721.393.
Thus, the square root of 520 408 is not an integer, and therefore 520 408 is not a square number.
The square of a number (here 520 408) is the result of the product of this number (520 408) by itself (i.e., 520 408 × 520 408); the square of 520 408 is sometimes called "raising 520 408 to the power 2", or "520 408 squared".
The square of 520 408 is 270 824 486 464 because 520 408 × 520 408 = 520 4082 = 270 824 486 464.
As a consequence, 520 408 is the square root of 270 824 486 464.
The multiples of 520 408 are all integers evenly divisible by 520 408, that is all numbers such that the remainder of the division by 520 408 is zero. There are infinitely many multiples of 520 408. The smallest multiples of 520 408 are: