It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 499 518 is not a prime number.
For example, 499 518 can be divided by 2: 499 518 / 2 = 249 759.
For 499 518 to be a prime number, it would have been required that 499 518 has only two divisors, i.e., itself and 1.
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499 518 is an even number, because it is evenly divisible by 2: 499 518 / 2 = 249 759.
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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 499 518 is about 706.766.
Thus, the square root of 499 518 is not an integer, and therefore 499 518 is not a square number.
The square of a number (here 499 518) is the result of the product of this number (499 518) by itself (i.e., 499 518 × 499 518); the square of 499 518 is sometimes called "raising 499 518 to the power 2", or "499 518 squared".
The square of 499 518 is 249 518 232 324 because 499 518 × 499 518 = 499 5182 = 249 518 232 324.
As a consequence, 499 518 is the square root of 249 518 232 324.
The multiples of 499 518 are all integers evenly divisible by 499 518, that is all numbers such that the remainder of the division by 499 518 is zero. There are infinitely many multiples of 499 518. The smallest multiples of 499 518 are: