It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 729 518 is not a prime number.
For example, 729 518 can be divided by 2: 729 518 / 2 = 364 759.
For 729 518 to be a prime number, it would have been required that 729 518 has only two divisors, i.e., itself and 1.
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729 518 is an even number, because it is evenly divisible by 2: 729 518 / 2 = 364 759.
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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 729 518 is about 854.118.
Thus, the square root of 729 518 is not an integer, and therefore 729 518 is not a square number.
The square of a number (here 729 518) is the result of the product of this number (729 518) by itself (i.e., 729 518 × 729 518); the square of 729 518 is sometimes called "raising 729 518 to the power 2", or "729 518 squared".
The square of 729 518 is 532 196 512 324 because 729 518 × 729 518 = 729 5182 = 532 196 512 324.
As a consequence, 729 518 is the square root of 532 196 512 324.
The multiples of 729 518 are all integers evenly divisible by 729 518, that is all numbers such that the remainder of the division by 729 518 is zero. There are infinitely many multiples of 729 518. The smallest multiples of 729 518 are: