It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 645 518 is not a prime number.
For example, 645 518 can be divided by 2: 645 518 / 2 = 322 759.
For 645 518 to be a prime number, it would have been required that 645 518 has only two divisors, i.e., itself and 1.
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645 518 is an even number, because it is evenly divisible by 2: 645 518 / 2 = 322 759.
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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 645 518 is about 803.441.
Thus, the square root of 645 518 is not an integer, and therefore 645 518 is not a square number.
The square of a number (here 645 518) is the result of the product of this number (645 518) by itself (i.e., 645 518 × 645 518); the square of 645 518 is sometimes called "raising 645 518 to the power 2", or "645 518 squared".
The square of 645 518 is 416 693 488 324 because 645 518 × 645 518 = 645 5182 = 416 693 488 324.
As a consequence, 645 518 is the square root of 416 693 488 324.
The multiples of 645 518 are all integers evenly divisible by 645 518, that is all numbers such that the remainder of the division by 645 518 is zero. There are infinitely many multiples of 645 518. The smallest multiples of 645 518 are: