It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 424 is not a prime number.
For example, 998 424 can be divided by 2: 998 424 / 2 = 499 212.
For 998 424 to be a prime number, it would have been required that 998 424 has only two divisors, i.e., itself and 1.
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998 424 is an even number, because it is evenly divisible by 2: 998 424 / 2 = 499 212.
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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 998 424 is about 999.212.
Thus, the square root of 998 424 is not an integer, and therefore 998 424 is not a square number.
The square of a number (here 998 424) is the result of the product of this number (998 424) by itself (i.e., 998 424 × 998 424); the square of 998 424 is sometimes called "raising 998 424 to the power 2", or "998 424 squared".
The square of 998 424 is 996 850 483 776 because 998 424 × 998 424 = 998 4242 = 996 850 483 776.
As a consequence, 998 424 is the square root of 996 850 483 776.
The multiples of 998 424 are all integers evenly divisible by 998 424, that is all numbers such that the remainder of the division by 998 424 is zero. There are infinitely many multiples of 998 424. The smallest multiples of 998 424 are: