It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 397 is not a prime number.
For example, 998 397 can be divided by 3: 998 397 / 3 = 332 799.
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For 998 397 to be a prime number, it would have been required that 998 397 has only two divisors, i.e., itself and 1.
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998 397 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 998 397 is about 999.198.
Thus, the square root of 998 397 is not an integer, and therefore 998 397 is not a square number.
The square of a number (here 998 397) is the result of the product of this number (998 397) by itself (i.e., 998 397 × 998 397); the square of 998 397 is sometimes called "raising 998 397 to the power 2", or "998 397 squared".
The square of 998 397 is 996 796 569 609 because 998 397 × 998 397 = 998 3972 = 996 796 569 609.
As a consequence, 998 397 is the square root of 996 796 569 609.
The multiples of 998 397 are all integers evenly divisible by 998 397, that is all numbers such that the remainder of the division by 998 397 is zero. There are infinitely many multiples of 998 397. The smallest multiples of 998 397 are: