It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 734 is not a prime number.
For example, 644 734 can be divided by 2: 644 734 / 2 = 322 367.
For 644 734 to be a prime number, it would have been required that 644 734 has only two divisors, i.e., itself and 1.
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644 734 is an even number, because it is evenly divisible by 2: 644 734 / 2 = 322 367.
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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 644 734 is about 802.953.
Thus, the square root of 644 734 is not an integer, and therefore 644 734 is not a square number.
The square of a number (here 644 734) is the result of the product of this number (644 734) by itself (i.e., 644 734 × 644 734); the square of 644 734 is sometimes called "raising 644 734 to the power 2", or "644 734 squared".
The square of 644 734 is 415 681 930 756 because 644 734 × 644 734 = 644 7342 = 415 681 930 756.
As a consequence, 644 734 is the square root of 415 681 930 756.
The multiples of 644 734 are all integers evenly divisible by 644 734, that is all numbers such that the remainder of the division by 644 734 is zero. There are infinitely many multiples of 644 734. The smallest multiples of 644 734 are: