It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 518 is not a prime number.
For example, 644 518 can be divided by 2: 644 518 / 2 = 322 259.
For 644 518 to be a prime number, it would have been required that 644 518 has only two divisors, i.e., itself and 1.
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644 518 is an even number, because it is evenly divisible by 2: 644 518 / 2 = 322 259.
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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 644 518 is about 802.819.
Thus, the square root of 644 518 is not an integer, and therefore 644 518 is not a square number.
The square of a number (here 644 518) is the result of the product of this number (644 518) by itself (i.e., 644 518 × 644 518); the square of 644 518 is sometimes called "raising 644 518 to the power 2", or "644 518 squared".
The square of 644 518 is 415 403 452 324 because 644 518 × 644 518 = 644 5182 = 415 403 452 324.
As a consequence, 644 518 is the square root of 415 403 452 324.
The multiples of 644 518 are all integers evenly divisible by 644 518, that is all numbers such that the remainder of the division by 644 518 is zero. There are infinitely many multiples of 644 518. The smallest multiples of 644 518 are: