It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 738 is not a prime number.
For example, 518 738 can be divided by 2: 518 738 / 2 = 259 369.
For 518 738 to be a prime number, it would have been required that 518 738 has only two divisors, i.e., itself and 1.
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518 738 is an even number, because it is evenly divisible by 2: 518 738 / 2 = 259 369.
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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 518 738 is about 720.235.
Thus, the square root of 518 738 is not an integer, and therefore 518 738 is not a square number.
The square of a number (here 518 738) is the result of the product of this number (518 738) by itself (i.e., 518 738 × 518 738); the square of 518 738 is sometimes called "raising 518 738 to the power 2", or "518 738 squared".
The square of 518 738 is 269 089 112 644 because 518 738 × 518 738 = 518 7382 = 269 089 112 644.
As a consequence, 518 738 is the square root of 269 089 112 644.
The multiples of 518 738 are all integers evenly divisible by 518 738, that is all numbers such that the remainder of the division by 518 738 is zero. There are infinitely many multiples of 518 738. The smallest multiples of 518 738 are: