It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 671 is not a prime number.
For example, 518 671 can be divided by 509: 518 671 / 509 = 1 019.
For 518 671 to be a prime number, it would have been required that 518 671 has only two divisors, i.e., itself and 1.
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518 671 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 518 671 is about 720.188.
Thus, the square root of 518 671 is not an integer, and therefore 518 671 is not a square number.
The square of a number (here 518 671) is the result of the product of this number (518 671) by itself (i.e., 518 671 × 518 671); the square of 518 671 is sometimes called "raising 518 671 to the power 2", or "518 671 squared".
The square of 518 671 is 269 019 606 241 because 518 671 × 518 671 = 518 6712 = 269 019 606 241.
As a consequence, 518 671 is the square root of 269 019 606 241.
The multiples of 518 671 are all integers evenly divisible by 518 671, that is all numbers such that the remainder of the division by 518 671 is zero. There are infinitely many multiples of 518 671. The smallest multiples of 518 671 are: