It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 313 is not a prime number.
For example, 998 313 can be divided by 3: 998 313 / 3 = 332 771.
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For 998 313 to be a prime number, it would have been required that 998 313 has only two divisors, i.e., itself and 1.
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998 313 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 998 313 is about 999.156.
Thus, the square root of 998 313 is not an integer, and therefore 998 313 is not a square number.
The square of a number (here 998 313) is the result of the product of this number (998 313) by itself (i.e., 998 313 × 998 313); the square of 998 313 is sometimes called "raising 998 313 to the power 2", or "998 313 squared".
The square of 998 313 is 996 628 845 969 because 998 313 × 998 313 = 998 3132 = 996 628 845 969.
As a consequence, 998 313 is the square root of 996 628 845 969.
The multiples of 998 313 are all integers evenly divisible by 998 313, that is all numbers such that the remainder of the division by 998 313 is zero. There are infinitely many multiples of 998 313. The smallest multiples of 998 313 are: