It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 716 816 is not a prime number.
For example, 518 716 816 can be divided by 2: 518 716 816 / 2 = 259 358 408.
For 518 716 816 to be a prime number, it would have been required that 518 716 816 has only two divisors, i.e., itself and 1.
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518 716 816 is an even number, because it is evenly divisible by 2: 518 716 816 / 2 = 259 358 408.
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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 518 716 816 is about 22 775.355.
Thus, the square root of 518 716 816 is not an integer, and therefore 518 716 816 is not a square number.
The square of a number (here 518 716 816) is the result of the product of this number (518 716 816) by itself (i.e., 518 716 816 × 518 716 816); the square of 518 716 816 is sometimes called "raising 518 716 816 to the power 2", or "518 716 816 squared".
The square of 518 716 816 is 269 067 135 201 177 856 because 518 716 816 × 518 716 816 = 518 716 8162 = 269 067 135 201 177 856.
As a consequence, 518 716 816 is the square root of 269 067 135 201 177 856.
518 716 816 is a number with 9 digits.
The multiples of 518 716 816 are all integers evenly divisible by 518 716 816, that is all numbers such that the remainder of the division by 518 716 816 is zero. There are infinitely many multiples of 518 716 816. The smallest multiples of 518 716 816 are: