It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 534 is not a prime number.
For example, 518 534 can be divided by 2: 518 534 / 2 = 259 267.
For 518 534 to be a prime number, it would have been required that 518 534 has only two divisors, i.e., itself and 1.
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518 534 is an even number, because it is evenly divisible by 2: 518 534 / 2 = 259 267.
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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 518 534 is about 720.093.
Thus, the square root of 518 534 is not an integer, and therefore 518 534 is not a square number.
The square of a number (here 518 534) is the result of the product of this number (518 534) by itself (i.e., 518 534 × 518 534); the square of 518 534 is sometimes called "raising 518 534 to the power 2", or "518 534 squared".
The square of 518 534 is 268 877 509 156 because 518 534 × 518 534 = 518 5342 = 268 877 509 156.
As a consequence, 518 534 is the square root of 268 877 509 156.
The multiples of 518 534 are all integers evenly divisible by 518 534, that is all numbers such that the remainder of the division by 518 534 is zero. There are infinitely many multiples of 518 534. The smallest multiples of 518 534 are: