It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 514 is not a prime number.
For example, 518 514 can be divided by 2: 518 514 / 2 = 259 257.
For 518 514 to be a prime number, it would have been required that 518 514 has only two divisors, i.e., itself and 1.
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518 514 is an even number, because it is evenly divisible by 2: 518 514 / 2 = 259 257.
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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 518 514 is about 720.079.
Thus, the square root of 518 514 is not an integer, and therefore 518 514 is not a square number.
The square of a number (here 518 514) is the result of the product of this number (518 514) by itself (i.e., 518 514 × 518 514); the square of 518 514 is sometimes called "raising 518 514 to the power 2", or "518 514 squared".
The square of 518 514 is 268 856 768 196 because 518 514 × 518 514 = 518 5142 = 268 856 768 196.
As a consequence, 518 514 is the square root of 268 856 768 196.
The multiples of 518 514 are all integers evenly divisible by 518 514, that is all numbers such that the remainder of the division by 518 514 is zero. There are infinitely many multiples of 518 514. The smallest multiples of 518 514 are: