It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 515 968 is not a prime number.
For example, 518 515 968 can be divided by 2: 518 515 968 / 2 = 259 257 984.
For 518 515 968 to be a prime number, it would have been required that 518 515 968 has only two divisors, i.e., itself and 1.
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518 515 968 is an even number, because it is evenly divisible by 2: 518 515 968 / 2 = 259 257 984.
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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 518 515 968 is about 22 770.946.
Thus, the square root of 518 515 968 is not an integer, and therefore 518 515 968 is not a square number.
The square of a number (here 518 515 968) is the result of the product of this number (518 515 968) by itself (i.e., 518 515 968 × 518 515 968); the square of 518 515 968 is sometimes called "raising 518 515 968 to the power 2", or "518 515 968 squared".
The square of 518 515 968 is 268 858 809 070 977 024 because 518 515 968 × 518 515 968 = 518 515 9682 = 268 858 809 070 977 024.
As a consequence, 518 515 968 is the square root of 268 858 809 070 977 024.
518 515 968 is a number with 9 digits.
The multiples of 518 515 968 are all integers evenly divisible by 518 515 968, that is all numbers such that the remainder of the division by 518 515 968 is zero. There are infinitely many multiples of 518 515 968. The smallest multiples of 518 515 968 are: