It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 638 720 644 is not a prime number.
For example, 638 720 644 can be divided by 2: 638 720 644 / 2 = 319 360 322.
For 638 720 644 to be a prime number, it would have been required that 638 720 644 has only two divisors, i.e., itself and 1.
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638 720 644 is an even number, because it is evenly divisible by 2: 638 720 644 / 2 = 319 360 322.
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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 638 720 644 is about 25 272.923.
Thus, the square root of 638 720 644 is not an integer, and therefore 638 720 644 is not a square number.
The square of a number (here 638 720 644) is the result of the product of this number (638 720 644) by itself (i.e., 638 720 644 × 638 720 644); the square of 638 720 644 is sometimes called "raising 638 720 644 to the power 2", or "638 720 644 squared".
The square of 638 720 644 is 407 964 061 071 774 720 because 638 720 644 × 638 720 644 = 638 720 6442 = 407 964 061 071 774 720.
As a consequence, 638 720 644 is the square root of 407 964 061 071 774 720.
638 720 644 is a number with 9 digits.
The multiples of 638 720 644 are all integers evenly divisible by 638 720 644, that is all numbers such that the remainder of the division by 638 720 644 is zero. There are infinitely many multiples of 638 720 644. The smallest multiples of 638 720 644 are: