It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 331 is not a prime number.
For example, 998 331 can be divided by 3: 998 331 / 3 = 332 777.
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For 998 331 to be a prime number, it would have been required that 998 331 has only two divisors, i.e., itself and 1.
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998 331 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 998 331 is about 999.165.
Thus, the square root of 998 331 is not an integer, and therefore 998 331 is not a square number.
The square of a number (here 998 331) is the result of the product of this number (998 331) by itself (i.e., 998 331 × 998 331); the square of 998 331 is sometimes called "raising 998 331 to the power 2", or "998 331 squared".
The square of 998 331 is 996 664 785 561 because 998 331 × 998 331 = 998 3312 = 996 664 785 561.
As a consequence, 998 331 is the square root of 996 664 785 561.
The multiples of 998 331 are all integers evenly divisible by 998 331, that is all numbers such that the remainder of the division by 998 331 is zero. There are infinitely many multiples of 998 331. The smallest multiples of 998 331 are: