It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 042 is not a prime number.
For example, 998 042 can be divided by 2: 998 042 / 2 = 499 021.
For 998 042 to be a prime number, it would have been required that 998 042 has only two divisors, i.e., itself and 1.
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998 042 is an even number, because it is evenly divisible by 2: 998 042 / 2 = 499 021.
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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 998 042 is about 999.021.
Thus, the square root of 998 042 is not an integer, and therefore 998 042 is not a square number.
The square of a number (here 998 042) is the result of the product of this number (998 042) by itself (i.e., 998 042 × 998 042); the square of 998 042 is sometimes called "raising 998 042 to the power 2", or "998 042 squared".
The square of 998 042 is 996 087 833 764 because 998 042 × 998 042 = 998 0422 = 996 087 833 764.
As a consequence, 998 042 is the square root of 996 087 833 764.
The multiples of 998 042 are all integers evenly divisible by 998 042, that is all numbers such that the remainder of the division by 998 042 is zero. There are infinitely many multiples of 998 042. The smallest multiples of 998 042 are: