It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 993 is not a prime number.
For example, 518 993 can be divided by 17: 518 993 / 17 = 30 529.
For 518 993 to be a prime number, it would have been required that 518 993 has only two divisors, i.e., itself and 1.
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518 993 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 518 993 is about 720.412.
Thus, the square root of 518 993 is not an integer, and therefore 518 993 is not a square number.
The square of a number (here 518 993) is the result of the product of this number (518 993) by itself (i.e., 518 993 × 518 993); the square of 518 993 is sometimes called "raising 518 993 to the power 2", or "518 993 squared".
The square of 518 993 is 269 353 734 049 because 518 993 × 518 993 = 518 9932 = 269 353 734 049.
As a consequence, 518 993 is the square root of 269 353 734 049.
The multiples of 518 993 are all integers evenly divisible by 518 993, that is all numbers such that the remainder of the division by 518 993 is zero. There are infinitely many multiples of 518 993. The smallest multiples of 518 993 are: