It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 566 518 is not a prime number.
For example, 566 518 can be divided by 2: 566 518 / 2 = 283 259.
For 566 518 to be a prime number, it would have been required that 566 518 has only two divisors, i.e., itself and 1.
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566 518 is an even number, because it is evenly divisible by 2: 566 518 / 2 = 283 259.
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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 566 518 is about 752.674.
Thus, the square root of 566 518 is not an integer, and therefore 566 518 is not a square number.
The square of a number (here 566 518) is the result of the product of this number (566 518) by itself (i.e., 566 518 × 566 518); the square of 566 518 is sometimes called "raising 566 518 to the power 2", or "566 518 squared".
The square of 566 518 is 320 942 644 324 because 566 518 × 566 518 = 566 5182 = 320 942 644 324.
As a consequence, 566 518 is the square root of 320 942 644 324.
The multiples of 566 518 are all integers evenly divisible by 566 518, that is all numbers such that the remainder of the division by 566 518 is zero. There are infinitely many multiples of 566 518. The smallest multiples of 566 518 are: