It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 636 018 816 is not a prime number.
For example, 636 018 816 can be divided by 2: 636 018 816 / 2 = 318 009 408.
For 636 018 816 to be a prime number, it would have been required that 636 018 816 has only two divisors, i.e., itself and 1.
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636 018 816 is an even number, because it is evenly divisible by 2: 636 018 816 / 2 = 318 009 408.
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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 636 018 816 is about 25 219.413.
Thus, the square root of 636 018 816 is not an integer, and therefore 636 018 816 is not a square number.
The square of a number (here 636 018 816) is the result of the product of this number (636 018 816) by itself (i.e., 636 018 816 × 636 018 816); the square of 636 018 816 is sometimes called "raising 636 018 816 to the power 2", or "636 018 816 squared".
The square of 636 018 816 is 404 519 934 306 041 856 because 636 018 816 × 636 018 816 = 636 018 8162 = 404 519 934 306 041 856.
As a consequence, 636 018 816 is the square root of 404 519 934 306 041 856.
636 018 816 is a number with 9 digits.
The multiples of 636 018 816 are all integers evenly divisible by 636 018 816, that is all numbers such that the remainder of the division by 636 018 816 is zero. There are infinitely many multiples of 636 018 816. The smallest multiples of 636 018 816 are: