It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 506 518 is not a prime number.
For example, 506 518 can be divided by 2: 506 518 / 2 = 253 259.
For 506 518 to be a prime number, it would have been required that 506 518 has only two divisors, i.e., itself and 1.
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506 518 is an even number, because it is evenly divisible by 2: 506 518 / 2 = 253 259.
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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 506 518 is about 711.701.
Thus, the square root of 506 518 is not an integer, and therefore 506 518 is not a square number.
The square of a number (here 506 518) is the result of the product of this number (506 518) by itself (i.e., 506 518 × 506 518); the square of 506 518 is sometimes called "raising 506 518 to the power 2", or "506 518 squared".
The square of 506 518 is 256 560 484 324 because 506 518 × 506 518 = 506 5182 = 256 560 484 324.
As a consequence, 506 518 is the square root of 256 560 484 324.
The multiples of 506 518 are all integers evenly divisible by 506 518, that is all numbers such that the remainder of the division by 506 518 is zero. There are infinitely many multiples of 506 518. The smallest multiples of 506 518 are: