It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 744 is not a prime number.
For example, 644 744 can be divided by 2: 644 744 / 2 = 322 372.
For 644 744 to be a prime number, it would have been required that 644 744 has only two divisors, i.e., itself and 1.
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644 744 is an even number, because it is evenly divisible by 2: 644 744 / 2 = 322 372.
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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 644 744 is about 802.960.
Thus, the square root of 644 744 is not an integer, and therefore 644 744 is not a square number.
The square of a number (here 644 744) is the result of the product of this number (644 744) by itself (i.e., 644 744 × 644 744); the square of 644 744 is sometimes called "raising 644 744 to the power 2", or "644 744 squared".
The square of 644 744 is 415 694 825 536 because 644 744 × 644 744 = 644 7442 = 415 694 825 536.
As a consequence, 644 744 is the square root of 415 694 825 536.
The multiples of 644 744 are all integers evenly divisible by 644 744, that is all numbers such that the remainder of the division by 644 744 is zero. There are infinitely many multiples of 644 744. The smallest multiples of 644 744 are: