It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 996 is not a prime number.
For example, 998 996 can be divided by 2: 998 996 / 2 = 499 498.
For 998 996 to be a prime number, it would have been required that 998 996 has only two divisors, i.e., itself and 1.
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998 996 is an even number, because it is evenly divisible by 2: 998 996 / 2 = 499 498.
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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 998 996 is about 999.498.
Thus, the square root of 998 996 is not an integer, and therefore 998 996 is not a square number.
The square of a number (here 998 996) is the result of the product of this number (998 996) by itself (i.e., 998 996 × 998 996); the square of 998 996 is sometimes called "raising 998 996 to the power 2", or "998 996 squared".
The square of 998 996 is 997 993 008 016 because 998 996 × 998 996 = 998 9962 = 997 993 008 016.
As a consequence, 998 996 is the square root of 997 993 008 016.
The multiples of 998 996 are all integers evenly divisible by 998 996, that is all numbers such that the remainder of the division by 998 996 is zero. There are infinitely many multiples of 998 996. The smallest multiples of 998 996 are: