It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 478 is not a prime number.
For example, 998 478 can be divided by 2: 998 478 / 2 = 499 239.
For 998 478 to be a prime number, it would have been required that 998 478 has only two divisors, i.e., itself and 1.
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998 478 is an even number, because it is evenly divisible by 2: 998 478 / 2 = 499 239.
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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 998 478 is about 999.239.
Thus, the square root of 998 478 is not an integer, and therefore 998 478 is not a square number.
The square of a number (here 998 478) is the result of the product of this number (998 478) by itself (i.e., 998 478 × 998 478); the square of 998 478 is sometimes called "raising 998 478 to the power 2", or "998 478 squared".
The square of 998 478 is 996 958 316 484 because 998 478 × 998 478 = 998 4782 = 996 958 316 484.
As a consequence, 998 478 is the square root of 996 958 316 484.
The multiples of 998 478 are all integers evenly divisible by 998 478, that is all numbers such that the remainder of the division by 998 478 is zero. There are infinitely many multiples of 998 478. The smallest multiples of 998 478 are: