It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 558 518 is not a prime number.
For example, 558 518 can be divided by 2: 558 518 / 2 = 279 259.
For 558 518 to be a prime number, it would have been required that 558 518 has only two divisors, i.e., itself and 1.
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558 518 is an even number, because it is evenly divisible by 2: 558 518 / 2 = 279 259.
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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 558 518 is about 747.341.
Thus, the square root of 558 518 is not an integer, and therefore 558 518 is not a square number.
The square of a number (here 558 518) is the result of the product of this number (558 518) by itself (i.e., 558 518 × 558 518); the square of 558 518 is sometimes called "raising 558 518 to the power 2", or "558 518 squared".
The square of 558 518 is 311 942 356 324 because 558 518 × 558 518 = 558 5182 = 311 942 356 324.
As a consequence, 558 518 is the square root of 311 942 356 324.
The multiples of 558 518 are all integers evenly divisible by 558 518, that is all numbers such that the remainder of the division by 558 518 is zero. There are infinitely many multiples of 558 518. The smallest multiples of 558 518 are: