It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 724 518 is not a prime number.
For example, 724 518 can be divided by 2: 724 518 / 2 = 362 259.
For 724 518 to be a prime number, it would have been required that 724 518 has only two divisors, i.e., itself and 1.
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724 518 is an even number, because it is evenly divisible by 2: 724 518 / 2 = 362 259.
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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 724 518 is about 851.186.
Thus, the square root of 724 518 is not an integer, and therefore 724 518 is not a square number.
The square of a number (here 724 518) is the result of the product of this number (724 518) by itself (i.e., 724 518 × 724 518); the square of 724 518 is sometimes called "raising 724 518 to the power 2", or "724 518 squared".
The square of 724 518 is 524 926 332 324 because 724 518 × 724 518 = 724 5182 = 524 926 332 324.
As a consequence, 724 518 is the square root of 524 926 332 324.
The multiples of 724 518 are all integers evenly divisible by 724 518, that is all numbers such that the remainder of the division by 724 518 is zero. There are infinitely many multiples of 724 518. The smallest multiples of 724 518 are: