It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 618 is not a prime number.
For example, 518 618 can be divided by 2: 518 618 / 2 = 259 309.
For 518 618 to be a prime number, it would have been required that 518 618 has only two divisors, i.e., itself and 1.
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518 618 is an even number, because it is evenly divisible by 2: 518 618 / 2 = 259 309.
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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 518 618 is about 720.151.
Thus, the square root of 518 618 is not an integer, and therefore 518 618 is not a square number.
The square of a number (here 518 618) is the result of the product of this number (518 618) by itself (i.e., 518 618 × 518 618); the square of 518 618 is sometimes called "raising 518 618 to the power 2", or "518 618 squared".
The square of 518 618 is 268 964 629 924 because 518 618 × 518 618 = 518 6182 = 268 964 629 924.
As a consequence, 518 618 is the square root of 268 964 629 924.
The multiples of 518 618 are all integers evenly divisible by 518 618, that is all numbers such that the remainder of the division by 518 618 is zero. There are infinitely many multiples of 518 618. The smallest multiples of 518 618 are: