It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 994 998 is not a prime number.
For example, 994 998 can be divided by 2: 994 998 / 2 = 497 499.
For 994 998 to be a prime number, it would have been required that 994 998 has only two divisors, i.e., itself and 1.
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994 998 is an even number, because it is evenly divisible by 2: 994 998 / 2 = 497 499.
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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 994 998 is about 997.496.
Thus, the square root of 994 998 is not an integer, and therefore 994 998 is not a square number.
The square of a number (here 994 998) is the result of the product of this number (994 998) by itself (i.e., 994 998 × 994 998); the square of 994 998 is sometimes called "raising 994 998 to the power 2", or "994 998 squared".
The square of 994 998 is 990 021 020 004 because 994 998 × 994 998 = 994 9982 = 990 021 020 004.
As a consequence, 994 998 is the square root of 990 021 020 004.
The multiples of 994 998 are all integers evenly divisible by 994 998, that is all numbers such that the remainder of the division by 994 998 is zero. There are infinitely many multiples of 994 998. The smallest multiples of 994 998 are: