It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 641 is not a prime number.
For example, 518 641 can be divided by 313: 518 641 / 313 = 1 657.
For 518 641 to be a prime number, it would have been required that 518 641 has only two divisors, i.e., itself and 1.
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518 641 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 518 641 is about 720.167.
Thus, the square root of 518 641 is not an integer, and therefore 518 641 is not a square number.
The square of a number (here 518 641) is the result of the product of this number (518 641) by itself (i.e., 518 641 × 518 641); the square of 518 641 is sometimes called "raising 518 641 to the power 2", or "518 641 squared".
The square of 518 641 is 268 988 486 881 because 518 641 × 518 641 = 518 6412 = 268 988 486 881.
As a consequence, 518 641 is the square root of 268 988 486 881.
The multiples of 518 641 are all integers evenly divisible by 518 641, that is all numbers such that the remainder of the division by 518 641 is zero. There are infinitely many multiples of 518 641. The smallest multiples of 518 641 are: