It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 722 is not a prime number.
For example, 518 722 can be divided by 2: 518 722 / 2 = 259 361.
For 518 722 to be a prime number, it would have been required that 518 722 has only two divisors, i.e., itself and 1.
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518 722 is an even number, because it is evenly divisible by 2: 518 722 / 2 = 259 361.
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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 518 722 is about 720.224.
Thus, the square root of 518 722 is not an integer, and therefore 518 722 is not a square number.
The square of a number (here 518 722) is the result of the product of this number (518 722) by itself (i.e., 518 722 × 518 722); the square of 518 722 is sometimes called "raising 518 722 to the power 2", or "518 722 squared".
The square of 518 722 is 269 072 513 284 because 518 722 × 518 722 = 518 7222 = 269 072 513 284.
As a consequence, 518 722 is the square root of 269 072 513 284.
The multiples of 518 722 are all integers evenly divisible by 518 722, that is all numbers such that the remainder of the division by 518 722 is zero. There are infinitely many multiples of 518 722. The smallest multiples of 518 722 are: