It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 413 is not a prime number.
For example, 998 413 can be divided by 13: 998 413 / 13 = 76 801.
For 998 413 to be a prime number, it would have been required that 998 413 has only two divisors, i.e., itself and 1.
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998 413 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 998 413 is about 999.206.
Thus, the square root of 998 413 is not an integer, and therefore 998 413 is not a square number.
The square of a number (here 998 413) is the result of the product of this number (998 413) by itself (i.e., 998 413 × 998 413); the square of 998 413 is sometimes called "raising 998 413 to the power 2", or "998 413 squared".
The square of 998 413 is 996 828 518 569 because 998 413 × 998 413 = 998 4132 = 996 828 518 569.
As a consequence, 998 413 is the square root of 996 828 518 569.
The multiples of 998 413 are all integers evenly divisible by 998 413, that is all numbers such that the remainder of the division by 998 413 is zero. There are infinitely many multiples of 998 413. The smallest multiples of 998 413 are: