It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 638 is not a prime number.
For example, 998 638 can be divided by 2: 998 638 / 2 = 499 319.
For 998 638 to be a prime number, it would have been required that 998 638 has only two divisors, i.e., itself and 1.
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998 638 is an even number, because it is evenly divisible by 2: 998 638 / 2 = 499 319.
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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 998 638 is about 999.319.
Thus, the square root of 998 638 is not an integer, and therefore 998 638 is not a square number.
The square of a number (here 998 638) is the result of the product of this number (998 638) by itself (i.e., 998 638 × 998 638); the square of 998 638 is sometimes called "raising 998 638 to the power 2", or "998 638 squared".
The square of 998 638 is 997 277 855 044 because 998 638 × 998 638 = 998 6382 = 997 277 855 044.
As a consequence, 998 638 is the square root of 997 277 855 044.
The multiples of 998 638 are all integers evenly divisible by 998 638, that is all numbers such that the remainder of the division by 998 638 is zero. There are infinitely many multiples of 998 638. The smallest multiples of 998 638 are: