It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 328 518 is not a prime number.
For example, 328 518 can be divided by 2: 328 518 / 2 = 164 259.
For 328 518 to be a prime number, it would have been required that 328 518 has only two divisors, i.e., itself and 1.
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328 518 is an even number, because it is evenly divisible by 2: 328 518 / 2 = 164 259.
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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 328 518 is about 573.165.
Thus, the square root of 328 518 is not an integer, and therefore 328 518 is not a square number.
The square of a number (here 328 518) is the result of the product of this number (328 518) by itself (i.e., 328 518 × 328 518); the square of 328 518 is sometimes called "raising 328 518 to the power 2", or "328 518 squared".
The square of 328 518 is 107 924 076 324 because 328 518 × 328 518 = 328 5182 = 107 924 076 324.
As a consequence, 328 518 is the square root of 107 924 076 324.
The multiples of 328 518 are all integers evenly divisible by 328 518, that is all numbers such that the remainder of the division by 328 518 is zero. There are infinitely many multiples of 328 518. The smallest multiples of 328 518 are: