It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 336 is not a prime number.
For example, 518 336 can be divided by 2: 518 336 / 2 = 259 168.
For 518 336 to be a prime number, it would have been required that 518 336 has only two divisors, i.e., itself and 1.
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518 336 is an even number, because it is evenly divisible by 2: 518 336 / 2 = 259 168.
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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 518 336 is about 719.956.
Thus, the square root of 518 336 is not an integer, and therefore 518 336 is not a square number.
The square of a number (here 518 336) is the result of the product of this number (518 336) by itself (i.e., 518 336 × 518 336); the square of 518 336 is sometimes called "raising 518 336 to the power 2", or "518 336 squared".
The square of 518 336 is 268 672 208 896 because 518 336 × 518 336 = 518 3362 = 268 672 208 896.
As a consequence, 518 336 is the square root of 268 672 208 896.
The multiples of 518 336 are all integers evenly divisible by 518 336, that is all numbers such that the remainder of the division by 518 336 is zero. There are infinitely many multiples of 518 336. The smallest multiples of 518 336 are: