It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 431 is not a prime number.
For example, 998 431 can be divided by 7: 998 431 / 7 = 142 633.
For 998 431 to be a prime number, it would have been required that 998 431 has only two divisors, i.e., itself and 1.
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998 431 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 998 431 is about 999.215.
Thus, the square root of 998 431 is not an integer, and therefore 998 431 is not a square number.
The square of a number (here 998 431) is the result of the product of this number (998 431) by itself (i.e., 998 431 × 998 431); the square of 998 431 is sometimes called "raising 998 431 to the power 2", or "998 431 squared".
The square of 998 431 is 996 864 461 761 because 998 431 × 998 431 = 998 4312 = 996 864 461 761.
As a consequence, 998 431 is the square root of 996 864 461 761.
The multiples of 998 431 are all integers evenly divisible by 998 431, that is all numbers such that the remainder of the division by 998 431 is zero. There are infinitely many multiples of 998 431. The smallest multiples of 998 431 are: