It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 998 is not a prime number.
For example, 998 998 can be divided by 2: 998 998 / 2 = 499 499.
For 998 998 to be a prime number, it would have been required that 998 998 has only two divisors, i.e., itself and 1.
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998 998 is an even number, because it is evenly divisible by 2: 998 998 / 2 = 499 499.
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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 998 998 is about 999.499.
Thus, the square root of 998 998 is not an integer, and therefore 998 998 is not a square number.
The square of a number (here 998 998) is the result of the product of this number (998 998) by itself (i.e., 998 998 × 998 998); the square of 998 998 is sometimes called "raising 998 998 to the power 2", or "998 998 squared".
The square of 998 998 is 997 997 004 004 because 998 998 × 998 998 = 998 9982 = 997 997 004 004.
As a consequence, 998 998 is the square root of 997 997 004 004.
The multiples of 998 998 are all integers evenly divisible by 998 998, that is all numbers such that the remainder of the division by 998 998 is zero. There are infinitely many multiples of 998 998. The smallest multiples of 998 998 are: