It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 999 is not a prime number.
For example, 998 999 can be divided by 179: 998 999 / 179 = 5 581.
For 998 999 to be a prime number, it would have been required that 998 999 has only two divisors, i.e., itself and 1.
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998 999 is an odd number, because it is not evenly divisible by 2.
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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 998 999 is about 999.499.
Thus, the square root of 998 999 is not an integer, and therefore 998 999 is not a square number.
The square of a number (here 998 999) is the result of the product of this number (998 999) by itself (i.e., 998 999 × 998 999); the square of 998 999 is sometimes called "raising 998 999 to the power 2", or "998 999 squared".
The square of 998 999 is 997 999 002 001 because 998 999 × 998 999 = 998 9992 = 997 999 002 001.
As a consequence, 998 999 is the square root of 997 999 002 001.
The multiples of 998 999 are all integers evenly divisible by 998 999, that is all numbers such that the remainder of the division by 998 999 is zero. There are infinitely many multiples of 998 999. The smallest multiples of 998 999 are: