It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 412 is not a prime number.
For example, 518 412 can be divided by 2: 518 412 / 2 = 259 206.
For 518 412 to be a prime number, it would have been required that 518 412 has only two divisors, i.e., itself and 1.
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518 412 is an even number, because it is evenly divisible by 2: 518 412 / 2 = 259 206.
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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 518 412 is about 720.008.
Thus, the square root of 518 412 is not an integer, and therefore 518 412 is not a square number.
The square of a number (here 518 412) is the result of the product of this number (518 412) by itself (i.e., 518 412 × 518 412); the square of 518 412 is sometimes called "raising 518 412 to the power 2", or "518 412 squared".
The square of 518 412 is 268 751 001 744 because 518 412 × 518 412 = 518 4122 = 268 751 001 744.
As a consequence, 518 412 is the square root of 268 751 001 744.
The multiples of 518 412 are all integers evenly divisible by 518 412, that is all numbers such that the remainder of the division by 518 412 is zero. There are infinitely many multiples of 518 412. The smallest multiples of 518 412 are: