It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 516 is not a prime number.
For example, 644 516 can be divided by 2: 644 516 / 2 = 322 258.
For 644 516 to be a prime number, it would have been required that 644 516 has only two divisors, i.e., itself and 1.
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644 516 is an even number, because it is evenly divisible by 2: 644 516 / 2 = 322 258.
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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 644 516 is about 802.818.
Thus, the square root of 644 516 is not an integer, and therefore 644 516 is not a square number.
The square of a number (here 644 516) is the result of the product of this number (644 516) by itself (i.e., 644 516 × 644 516); the square of 644 516 is sometimes called "raising 644 516 to the power 2", or "644 516 squared".
The square of 644 516 is 415 400 874 256 because 644 516 × 644 516 = 644 5162 = 415 400 874 256.
As a consequence, 644 516 is the square root of 415 400 874 256.
The multiples of 644 516 are all integers evenly divisible by 644 516, that is all numbers such that the remainder of the division by 644 516 is zero. There are infinitely many multiples of 644 516. The smallest multiples of 644 516 are: