It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 418 is not a prime number.
For example, 518 418 can be divided by 2: 518 418 / 2 = 259 209.
For 518 418 to be a prime number, it would have been required that 518 418 has only two divisors, i.e., itself and 1.
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518 418 is an even number, because it is evenly divisible by 2: 518 418 / 2 = 259 209.
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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 518 418 is about 720.012.
Thus, the square root of 518 418 is not an integer, and therefore 518 418 is not a square number.
The square of a number (here 518 418) is the result of the product of this number (518 418) by itself (i.e., 518 418 × 518 418); the square of 518 418 is sometimes called "raising 518 418 to the power 2", or "518 418 squared".
The square of 518 418 is 268 757 222 724 because 518 418 × 518 418 = 518 4182 = 268 757 222 724.
As a consequence, 518 418 is the square root of 268 757 222 724.
The multiples of 518 418 are all integers evenly divisible by 518 418, that is all numbers such that the remainder of the division by 518 418 is zero. There are infinitely many multiples of 518 418. The smallest multiples of 518 418 are: