It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 716 is not a prime number.
For example, 644 716 can be divided by 2: 644 716 / 2 = 322 358.
For 644 716 to be a prime number, it would have been required that 644 716 has only two divisors, i.e., itself and 1.
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644 716 is an even number, because it is evenly divisible by 2: 644 716 / 2 = 322 358.
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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 644 716 is about 802.942.
Thus, the square root of 644 716 is not an integer, and therefore 644 716 is not a square number.
The square of a number (here 644 716) is the result of the product of this number (644 716) by itself (i.e., 644 716 × 644 716); the square of 644 716 is sometimes called "raising 644 716 to the power 2", or "644 716 squared".
The square of 644 716 is 415 658 720 656 because 644 716 × 644 716 = 644 7162 = 415 658 720 656.
As a consequence, 644 716 is the square root of 415 658 720 656.
The multiples of 644 716 are all integers evenly divisible by 644 716, that is all numbers such that the remainder of the division by 644 716 is zero. There are infinitely many multiples of 644 716. The smallest multiples of 644 716 are: