It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 636 is not a prime number.
For example, 518 636 can be divided by 2: 518 636 / 2 = 259 318.
For 518 636 to be a prime number, it would have been required that 518 636 has only two divisors, i.e., itself and 1.
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518 636 is an even number, because it is evenly divisible by 2: 518 636 / 2 = 259 318.
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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 518 636 is about 720.164.
Thus, the square root of 518 636 is not an integer, and therefore 518 636 is not a square number.
The square of a number (here 518 636) is the result of the product of this number (518 636) by itself (i.e., 518 636 × 518 636); the square of 518 636 is sometimes called "raising 518 636 to the power 2", or "518 636 squared".
The square of 518 636 is 268 983 300 496 because 518 636 × 518 636 = 518 6362 = 268 983 300 496.
As a consequence, 518 636 is the square root of 268 983 300 496.
The multiples of 518 636 are all integers evenly divisible by 518 636, that is all numbers such that the remainder of the division by 518 636 is zero. There are infinitely many multiples of 518 636. The smallest multiples of 518 636 are: