It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 421 is not a prime number.
For example, 518 421 can be divided by 3: 518 421 / 3 = 172 807.
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For 518 421 to be a prime number, it would have been required that 518 421 has only two divisors, i.e., itself and 1.
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518 421 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 518 421 is about 720.015.
Thus, the square root of 518 421 is not an integer, and therefore 518 421 is not a square number.
The square of a number (here 518 421) is the result of the product of this number (518 421) by itself (i.e., 518 421 × 518 421); the square of 518 421 is sometimes called "raising 518 421 to the power 2", or "518 421 squared".
The square of 518 421 is 268 760 333 241 because 518 421 × 518 421 = 518 4212 = 268 760 333 241.
As a consequence, 518 421 is the square root of 268 760 333 241.
The multiples of 518 421 are all integers evenly divisible by 518 421, that is all numbers such that the remainder of the division by 518 421 is zero. There are infinitely many multiples of 518 421. The smallest multiples of 518 421 are: