It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 996 638 is not a prime number.
For example, 996 638 can be divided by 2: 996 638 / 2 = 498 319.
For 996 638 to be a prime number, it would have been required that 996 638 has only two divisors, i.e., itself and 1.
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996 638 is an even number, because it is evenly divisible by 2: 996 638 / 2 = 498 319.
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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 996 638 is about 998.318.
Thus, the square root of 996 638 is not an integer, and therefore 996 638 is not a square number.
The square of a number (here 996 638) is the result of the product of this number (996 638) by itself (i.e., 996 638 × 996 638); the square of 996 638 is sometimes called "raising 996 638 to the power 2", or "996 638 squared".
The square of 996 638 is 993 287 303 044 because 996 638 × 996 638 = 996 6382 = 993 287 303 044.
As a consequence, 996 638 is the square root of 993 287 303 044.
The multiples of 996 638 are all integers evenly divisible by 996 638, that is all numbers such that the remainder of the division by 996 638 is zero. There are infinitely many multiples of 996 638. The smallest multiples of 996 638 are: