It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 021 is not a prime number.
For example, 998 021 can be divided by 61: 998 021 / 61 = 16 361.
For 998 021 to be a prime number, it would have been required that 998 021 has only two divisors, i.e., itself and 1.
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998 021 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 998 021 is about 999.010.
Thus, the square root of 998 021 is not an integer, and therefore 998 021 is not a square number.
The square of a number (here 998 021) is the result of the product of this number (998 021) by itself (i.e., 998 021 × 998 021); the square of 998 021 is sometimes called "raising 998 021 to the power 2", or "998 021 squared".
The square of 998 021 is 996 045 916 441 because 998 021 × 998 021 = 998 0212 = 996 045 916 441.
As a consequence, 998 021 is the square root of 996 045 916 441.
The multiples of 998 021 are all integers evenly divisible by 998 021, that is all numbers such that the remainder of the division by 998 021 is zero. There are infinitely many multiples of 998 021. The smallest multiples of 998 021 are: