It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 371 218 is not a prime number.
For example, 518 371 218 can be divided by 2: 518 371 218 / 2 = 259 185 609.
For 518 371 218 to be a prime number, it would have been required that 518 371 218 has only two divisors, i.e., itself and 1.
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518 371 218 is an even number, because it is evenly divisible by 2: 518 371 218 / 2 = 259 185 609.
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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 518 371 218 is about 22 767.767.
Thus, the square root of 518 371 218 is not an integer, and therefore 518 371 218 is not a square number.
The square of a number (here 518 371 218) is the result of the product of this number (518 371 218) by itself (i.e., 518 371 218 × 518 371 218); the square of 518 371 218 is sometimes called "raising 518 371 218 to the power 2", or "518 371 218 squared".
The square of 518 371 218 is 268 708 719 650 803 520 because 518 371 218 × 518 371 218 = 518 371 2182 = 268 708 719 650 803 520.
As a consequence, 518 371 218 is the square root of 268 708 719 650 803 520.
518 371 218 is a number with 9 digits.
The multiples of 518 371 218 are all integers evenly divisible by 518 371 218, that is all numbers such that the remainder of the division by 518 371 218 is zero. There are infinitely many multiples of 518 371 218. The smallest multiples of 518 371 218 are: