It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 538 is not a prime number.
For example, 518 538 can be divided by 2: 518 538 / 2 = 259 269.
For 518 538 to be a prime number, it would have been required that 518 538 has only two divisors, i.e., itself and 1.
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518 538 is an even number, because it is evenly divisible by 2: 518 538 / 2 = 259 269.
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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 518 538 is about 720.096.
Thus, the square root of 518 538 is not an integer, and therefore 518 538 is not a square number.
The square of a number (here 518 538) is the result of the product of this number (518 538) by itself (i.e., 518 538 × 518 538); the square of 518 538 is sometimes called "raising 518 538 to the power 2", or "518 538 squared".
The square of 518 538 is 268 881 657 444 because 518 538 × 518 538 = 518 5382 = 268 881 657 444.
As a consequence, 518 538 is the square root of 268 881 657 444.
The multiples of 518 538 are all integers evenly divisible by 518 538, that is all numbers such that the remainder of the division by 518 538 is zero. There are infinitely many multiples of 518 538. The smallest multiples of 518 538 are: