It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 107 is not a prime number.
For example, 518 107 can be divided by 43: 518 107 / 43 = 12 049.
For 518 107 to be a prime number, it would have been required that 518 107 has only two divisors, i.e., itself and 1.
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518 107 is an odd number, because it is not evenly divisible by 2.
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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 518 107 is about 719.796.
Thus, the square root of 518 107 is not an integer, and therefore 518 107 is not a square number.
The square of a number (here 518 107) is the result of the product of this number (518 107) by itself (i.e., 518 107 × 518 107); the square of 518 107 is sometimes called "raising 518 107 to the power 2", or "518 107 squared".
The square of 518 107 is 268 434 863 449 because 518 107 × 518 107 = 518 1072 = 268 434 863 449.
As a consequence, 518 107 is the square root of 268 434 863 449.
The multiples of 518 107 are all integers evenly divisible by 518 107, that is all numbers such that the remainder of the division by 518 107 is zero. There are infinitely many multiples of 518 107. The smallest multiples of 518 107 are: