It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 518 is not a prime number.
For example, 505 518 can be divided by 2: 505 518 / 2 = 252 759.
For 505 518 to be a prime number, it would have been required that 505 518 has only two divisors, i.e., itself and 1.
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505 518 is an even number, because it is evenly divisible by 2: 505 518 / 2 = 252 759.
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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 505 518 is about 710.998.
Thus, the square root of 505 518 is not an integer, and therefore 505 518 is not a square number.
The square of a number (here 505 518) is the result of the product of this number (505 518) by itself (i.e., 505 518 × 505 518); the square of 505 518 is sometimes called "raising 505 518 to the power 2", or "505 518 squared".
The square of 505 518 is 255 548 448 324 because 505 518 × 505 518 = 505 5182 = 255 548 448 324.
As a consequence, 505 518 is the square root of 255 548 448 324.
The multiples of 505 518 are all integers evenly divisible by 505 518, that is all numbers such that the remainder of the division by 505 518 is zero. There are infinitely many multiples of 505 518. The smallest multiples of 505 518 are: