It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 494 is not a prime number.
For example, 998 494 can be divided by 2: 998 494 / 2 = 499 247.
For 998 494 to be a prime number, it would have been required that 998 494 has only two divisors, i.e., itself and 1.
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998 494 is an even number, because it is evenly divisible by 2: 998 494 / 2 = 499 247.
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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 998 494 is about 999.247.
Thus, the square root of 998 494 is not an integer, and therefore 998 494 is not a square number.
The square of a number (here 998 494) is the result of the product of this number (998 494) by itself (i.e., 998 494 × 998 494); the square of 998 494 is sometimes called "raising 998 494 to the power 2", or "998 494 squared".
The square of 998 494 is 996 990 268 036 because 998 494 × 998 494 = 998 4942 = 996 990 268 036.
As a consequence, 998 494 is the square root of 996 990 268 036.
The multiples of 998 494 are all integers evenly divisible by 998 494, that is all numbers such that the remainder of the division by 998 494 is zero. There are infinitely many multiples of 998 494. The smallest multiples of 998 494 are: