It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 339 is not a prime number.
For example, 518 339 can be divided by 19: 518 339 / 19 = 27 281.
For 518 339 to be a prime number, it would have been required that 518 339 has only two divisors, i.e., itself and 1.
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518 339 is an odd number, because it is not evenly divisible by 2.
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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 518 339 is about 719.958.
Thus, the square root of 518 339 is not an integer, and therefore 518 339 is not a square number.
The square of a number (here 518 339) is the result of the product of this number (518 339) by itself (i.e., 518 339 × 518 339); the square of 518 339 is sometimes called "raising 518 339 to the power 2", or "518 339 squared".
The square of 518 339 is 268 675 318 921 because 518 339 × 518 339 = 518 3392 = 268 675 318 921.
As a consequence, 518 339 is the square root of 268 675 318 921.
The multiples of 518 339 are all integers evenly divisible by 518 339, that is all numbers such that the remainder of the division by 518 339 is zero. There are infinitely many multiples of 518 339. The smallest multiples of 518 339 are: