It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 414 is not a prime number.
For example, 998 414 can be divided by 2: 998 414 / 2 = 499 207.
For 998 414 to be a prime number, it would have been required that 998 414 has only two divisors, i.e., itself and 1.
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998 414 is an even number, because it is evenly divisible by 2: 998 414 / 2 = 499 207.
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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 998 414 is about 999.207.
Thus, the square root of 998 414 is not an integer, and therefore 998 414 is not a square number.
The square of a number (here 998 414) is the result of the product of this number (998 414) by itself (i.e., 998 414 × 998 414); the square of 998 414 is sometimes called "raising 998 414 to the power 2", or "998 414 squared".
The square of 998 414 is 996 830 515 396 because 998 414 × 998 414 = 998 4142 = 996 830 515 396.
As a consequence, 998 414 is the square root of 996 830 515 396.
The multiples of 998 414 are all integers evenly divisible by 998 414, that is all numbers such that the remainder of the division by 998 414 is zero. There are infinitely many multiples of 998 414. The smallest multiples of 998 414 are: