It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 474 is not a prime number.
For example, 518 474 can be divided by 2: 518 474 / 2 = 259 237.
For 518 474 to be a prime number, it would have been required that 518 474 has only two divisors, i.e., itself and 1.
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518 474 is an even number, because it is evenly divisible by 2: 518 474 / 2 = 259 237.
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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 518 474 is about 720.051.
Thus, the square root of 518 474 is not an integer, and therefore 518 474 is not a square number.
The square of a number (here 518 474) is the result of the product of this number (518 474) by itself (i.e., 518 474 × 518 474); the square of 518 474 is sometimes called "raising 518 474 to the power 2", or "518 474 squared".
The square of 518 474 is 268 815 288 676 because 518 474 × 518 474 = 518 4742 = 268 815 288 676.
As a consequence, 518 474 is the square root of 268 815 288 676.
The multiples of 518 474 are all integers evenly divisible by 518 474, that is all numbers such that the remainder of the division by 518 474 is zero. There are infinitely many multiples of 518 474. The smallest multiples of 518 474 are: