It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 500 518 is not a prime number.
For example, 500 518 can be divided by 2: 500 518 / 2 = 250 259.
For 500 518 to be a prime number, it would have been required that 500 518 has only two divisors, i.e., itself and 1.
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500 518 is an even number, because it is evenly divisible by 2: 500 518 / 2 = 250 259.
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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 500 518 is about 707.473.
Thus, the square root of 500 518 is not an integer, and therefore 500 518 is not a square number.
The square of a number (here 500 518) is the result of the product of this number (500 518) by itself (i.e., 500 518 × 500 518); the square of 500 518 is sometimes called "raising 500 518 to the power 2", or "500 518 squared".
The square of 500 518 is 250 518 268 324 because 500 518 × 500 518 = 500 5182 = 250 518 268 324.
As a consequence, 500 518 is the square root of 250 518 268 324.
The multiples of 500 518 are all integers evenly divisible by 500 518, that is all numbers such that the remainder of the division by 500 518 is zero. There are infinitely many multiples of 500 518. The smallest multiples of 500 518 are: