It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 742 is not a prime number.
For example, 518 742 can be divided by 2: 518 742 / 2 = 259 371.
For 518 742 to be a prime number, it would have been required that 518 742 has only two divisors, i.e., itself and 1.
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518 742 is an even number, because it is evenly divisible by 2: 518 742 / 2 = 259 371.
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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 518 742 is about 720.237.
Thus, the square root of 518 742 is not an integer, and therefore 518 742 is not a square number.
The square of a number (here 518 742) is the result of the product of this number (518 742) by itself (i.e., 518 742 × 518 742); the square of 518 742 is sometimes called "raising 518 742 to the power 2", or "518 742 squared".
The square of 518 742 is 269 093 262 564 because 518 742 × 518 742 = 518 7422 = 269 093 262 564.
As a consequence, 518 742 is the square root of 269 093 262 564.
The multiples of 518 742 are all integers evenly divisible by 518 742, that is all numbers such that the remainder of the division by 518 742 is zero. There are infinitely many multiples of 518 742. The smallest multiples of 518 742 are: