It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 636 738 is not a prime number.
For example, 636 738 can be divided by 2: 636 738 / 2 = 318 369.
For 636 738 to be a prime number, it would have been required that 636 738 has only two divisors, i.e., itself and 1.
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636 738 is an even number, because it is evenly divisible by 2: 636 738 / 2 = 318 369.
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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 636 738 is about 797.959.
Thus, the square root of 636 738 is not an integer, and therefore 636 738 is not a square number.
The square of a number (here 636 738) is the result of the product of this number (636 738) by itself (i.e., 636 738 × 636 738); the square of 636 738 is sometimes called "raising 636 738 to the power 2", or "636 738 squared".
The square of 636 738 is 405 435 280 644 because 636 738 × 636 738 = 636 7382 = 405 435 280 644.
As a consequence, 636 738 is the square root of 405 435 280 644.
The multiples of 636 738 are all integers evenly divisible by 636 738, that is all numbers such that the remainder of the division by 636 738 is zero. There are infinitely many multiples of 636 738. The smallest multiples of 636 738 are: