It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 725 518 is not a prime number.
For example, 725 518 can be divided by 2: 725 518 / 2 = 362 759.
For 725 518 to be a prime number, it would have been required that 725 518 has only two divisors, i.e., itself and 1.
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725 518 is an even number, because it is evenly divisible by 2: 725 518 / 2 = 362 759.
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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 725 518 is about 851.773.
Thus, the square root of 725 518 is not an integer, and therefore 725 518 is not a square number.
The square of a number (here 725 518) is the result of the product of this number (725 518) by itself (i.e., 725 518 × 725 518); the square of 725 518 is sometimes called "raising 725 518 to the power 2", or "725 518 squared".
The square of 725 518 is 526 376 368 324 because 725 518 × 725 518 = 725 5182 = 526 376 368 324.
As a consequence, 725 518 is the square root of 526 376 368 324.
The multiples of 725 518 are all integers evenly divisible by 725 518, that is all numbers such that the remainder of the division by 725 518 is zero. There are infinitely many multiples of 725 518. The smallest multiples of 725 518 are: