It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 632 644 is not a prime number.
For example, 720 632 644 can be divided by 2: 720 632 644 / 2 = 360 316 322.
For 720 632 644 to be a prime number, it would have been required that 720 632 644 has only two divisors, i.e., itself and 1.
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720 632 644 is an even number, because it is evenly divisible by 2: 720 632 644 / 2 = 360 316 322.
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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 720 632 644 is about 26 844.602.
Thus, the square root of 720 632 644 is not an integer, and therefore 720 632 644 is not a square number.
The square of a number (here 720 632 644) is the result of the product of this number (720 632 644) by itself (i.e., 720 632 644 × 720 632 644); the square of 720 632 644 is sometimes called "raising 720 632 644 to the power 2", or "720 632 644 squared".
The square of 720 632 644 is 519 311 407 598 430 720 because 720 632 644 × 720 632 644 = 720 632 6442 = 519 311 407 598 430 720.
As a consequence, 720 632 644 is the square root of 519 311 407 598 430 720.
720 632 644 is a number with 9 digits.
The multiples of 720 632 644 are all integers evenly divisible by 720 632 644, that is all numbers such that the remainder of the division by 720 632 644 is zero. There are infinitely many multiples of 720 632 644. The smallest multiples of 720 632 644 are: