It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 994 is not a prime number.
For example, 518 994 can be divided by 2: 518 994 / 2 = 259 497.
For 518 994 to be a prime number, it would have been required that 518 994 has only two divisors, i.e., itself and 1.
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518 994 is an even number, because it is evenly divisible by 2: 518 994 / 2 = 259 497.
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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 518 994 is about 720.412.
Thus, the square root of 518 994 is not an integer, and therefore 518 994 is not a square number.
The square of a number (here 518 994) is the result of the product of this number (518 994) by itself (i.e., 518 994 × 518 994); the square of 518 994 is sometimes called "raising 518 994 to the power 2", or "518 994 squared".
The square of 518 994 is 269 354 772 036 because 518 994 × 518 994 = 518 9942 = 269 354 772 036.
As a consequence, 518 994 is the square root of 269 354 772 036.
The multiples of 518 994 are all integers evenly divisible by 518 994, that is all numbers such that the remainder of the division by 518 994 is zero. There are infinitely many multiples of 518 994. The smallest multiples of 518 994 are: