It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 424 is not a prime number.
For example, 518 424 can be divided by 2: 518 424 / 2 = 259 212.
For 518 424 to be a prime number, it would have been required that 518 424 has only two divisors, i.e., itself and 1.
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518 424 is an even number, because it is evenly divisible by 2: 518 424 / 2 = 259 212.
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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 518 424 is about 720.017.
Thus, the square root of 518 424 is not an integer, and therefore 518 424 is not a square number.
The square of a number (here 518 424) is the result of the product of this number (518 424) by itself (i.e., 518 424 × 518 424); the square of 518 424 is sometimes called "raising 518 424 to the power 2", or "518 424 squared".
The square of 518 424 is 268 763 443 776 because 518 424 × 518 424 = 518 4242 = 268 763 443 776.
As a consequence, 518 424 is the square root of 268 763 443 776.
The multiples of 518 424 are all integers evenly divisible by 518 424, that is all numbers such that the remainder of the division by 518 424 is zero. There are infinitely many multiples of 518 424. The smallest multiples of 518 424 are: