It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 309 is not a prime number.
For example, 998 309 can be divided by 13: 998 309 / 13 = 76 793.
For 998 309 to be a prime number, it would have been required that 998 309 has only two divisors, i.e., itself and 1.
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998 309 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 998 309 is about 999.154.
Thus, the square root of 998 309 is not an integer, and therefore 998 309 is not a square number.
The square of a number (here 998 309) is the result of the product of this number (998 309) by itself (i.e., 998 309 × 998 309); the square of 998 309 is sometimes called "raising 998 309 to the power 2", or "998 309 squared".
The square of 998 309 is 996 620 859 481 because 998 309 × 998 309 = 998 3092 = 996 620 859 481.
As a consequence, 998 309 is the square root of 996 620 859 481.
The multiples of 998 309 are all integers evenly divisible by 998 309, that is all numbers such that the remainder of the division by 998 309 is zero. There are infinitely many multiples of 998 309. The smallest multiples of 998 309 are: