It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 636 018 is not a prime number.
For example, 636 018 can be divided by 2: 636 018 / 2 = 318 009.
For 636 018 to be a prime number, it would have been required that 636 018 has only two divisors, i.e., itself and 1.
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636 018 is an even number, because it is evenly divisible by 2: 636 018 / 2 = 318 009.
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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 is about 797.507.
Thus, the square root of 636 018 is not an integer, and therefore 636 018 is not a square number.
The square of a number (here 636 018) is the result of the product of this number (636 018) by itself (i.e., 636 018 × 636 018); the square of 636 018 is sometimes called "raising 636 018 to the power 2", or "636 018 squared".
The square of 636 018 is 404 518 896 324 because 636 018 × 636 018 = 636 0182 = 404 518 896 324.
As a consequence, 636 018 is the square root of 404 518 896 324.
The multiples of 636 018 are all integers evenly divisible by 636 018, that is all numbers such that the remainder of the division by 636 018 is zero. There are infinitely many multiples of 636 018. The smallest multiples of 636 018 are: