It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 747 002 is not a prime number.
For example, 644 747 002 can be divided by 2: 644 747 002 / 2 = 322 373 501.
For 644 747 002 to be a prime number, it would have been required that 644 747 002 has only two divisors, i.e., itself and 1.
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644 747 002 is an even number, because it is evenly divisible by 2: 644 747 002 / 2 = 322 373 501.
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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 644 747 002 is about 25 391.869.
Thus, the square root of 644 747 002 is not an integer, and therefore 644 747 002 is not a square number.
The square of a number (here 644 747 002) is the result of the product of this number (644 747 002) by itself (i.e., 644 747 002 × 644 747 002); the square of 644 747 002 is sometimes called "raising 644 747 002 to the power 2", or "644 747 002 squared".
The square of 644 747 002 is 415 698 696 587 988 032 because 644 747 002 × 644 747 002 = 644 747 0022 = 415 698 696 587 988 032.
As a consequence, 644 747 002 is the square root of 415 698 696 587 988 032.
644 747 002 is a number with 9 digits.
The multiples of 644 747 002 are all integers evenly divisible by 644 747 002, that is all numbers such that the remainder of the division by 644 747 002 is zero. There are infinitely many multiples of 644 747 002. The smallest multiples of 644 747 002 are: