It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 317 is not a prime number.
For example, 998 317 can be divided by 19: 998 317 / 19 = 52 543.
For 998 317 to be a prime number, it would have been required that 998 317 has only two divisors, i.e., itself and 1.
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998 317 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 998 317 is about 999.158.
Thus, the square root of 998 317 is not an integer, and therefore 998 317 is not a square number.
The square of a number (here 998 317) is the result of the product of this number (998 317) by itself (i.e., 998 317 × 998 317); the square of 998 317 is sometimes called "raising 998 317 to the power 2", or "998 317 squared".
The square of 998 317 is 996 636 832 489 because 998 317 × 998 317 = 998 3172 = 996 636 832 489.
As a consequence, 998 317 is the square root of 996 636 832 489.
The multiples of 998 317 are all integers evenly divisible by 998 317, that is all numbers such that the remainder of the division by 998 317 is zero. There are infinitely many multiples of 998 317. The smallest multiples of 998 317 are: