It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 418 is not a prime number.
For example, 520 418 can be divided by 2: 520 418 / 2 = 260 209.
For 520 418 to be a prime number, it would have been required that 520 418 has only two divisors, i.e., itself and 1.
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520 418 is an even number, because it is evenly divisible by 2: 520 418 / 2 = 260 209.
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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 520 418 is about 721.400.
Thus, the square root of 520 418 is not an integer, and therefore 520 418 is not a square number.
The square of a number (here 520 418) is the result of the product of this number (520 418) by itself (i.e., 520 418 × 520 418); the square of 520 418 is sometimes called "raising 520 418 to the power 2", or "520 418 squared".
The square of 520 418 is 270 834 894 724 because 520 418 × 520 418 = 520 4182 = 270 834 894 724.
As a consequence, 520 418 is the square root of 270 834 894 724.
The multiples of 520 418 are all integers evenly divisible by 520 418, that is all numbers such that the remainder of the division by 520 418 is zero. There are infinitely many multiples of 520 418. The smallest multiples of 520 418 are: