It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 636 644 is not a prime number.
For example, 636 644 can be divided by 2: 636 644 / 2 = 318 322.
For 636 644 to be a prime number, it would have been required that 636 644 has only two divisors, i.e., itself and 1.
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636 644 is an even number, because it is evenly divisible by 2: 636 644 / 2 = 318 322.
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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 636 644 is about 797.900.
Thus, the square root of 636 644 is not an integer, and therefore 636 644 is not a square number.
The square of a number (here 636 644) is the result of the product of this number (636 644) by itself (i.e., 636 644 × 636 644); the square of 636 644 is sometimes called "raising 636 644 to the power 2", or "636 644 squared".
The square of 636 644 is 405 315 582 736 because 636 644 × 636 644 = 636 6442 = 405 315 582 736.
As a consequence, 636 644 is the square root of 405 315 582 736.
The multiples of 636 644 are all integers evenly divisible by 636 644, that is all numbers such that the remainder of the division by 636 644 is zero. There are infinitely many multiples of 636 644. The smallest multiples of 636 644 are: