It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 502 016 is not a prime number.
For example, 644 502 016 can be divided by 2: 644 502 016 / 2 = 322 251 008.
For 644 502 016 to be a prime number, it would have been required that 644 502 016 has only two divisors, i.e., itself and 1.
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644 502 016 is an even number, because it is evenly divisible by 2: 644 502 016 / 2 = 322 251 008.
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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 644 502 016 is about 25 387.044.
Thus, the square root of 644 502 016 is not an integer, and therefore 644 502 016 is not a square number.
The square of a number (here 644 502 016) is the result of the product of this number (644 502 016) by itself (i.e., 644 502 016 × 644 502 016); the square of 644 502 016 is sometimes called "raising 644 502 016 to the power 2", or "644 502 016 squared".
The square of 644 502 016 is 415 382 848 628 064 256 because 644 502 016 × 644 502 016 = 644 502 0162 = 415 382 848 628 064 256.
As a consequence, 644 502 016 is the square root of 415 382 848 628 064 256.
644 502 016 is a number with 9 digits.
The multiples of 644 502 016 are all integers evenly divisible by 644 502 016, that is all numbers such that the remainder of the division by 644 502 016 is zero. There are infinitely many multiples of 644 502 016. The smallest multiples of 644 502 016 are: