It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 998 is not a prime number.
For example, 800 998 can be divided by 2: 800 998 / 2 = 400 499.
For 800 998 to be a prime number, it would have been required that 800 998 has only two divisors, i.e., itself and 1.
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800 998 is an even number, because it is evenly divisible by 2: 800 998 / 2 = 400 499.
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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 800 998 is about 894.985.
Thus, the square root of 800 998 is not an integer, and therefore 800 998 is not a square number.
The square of a number (here 800 998) is the result of the product of this number (800 998) by itself (i.e., 800 998 × 800 998); the square of 800 998 is sometimes called "raising 800 998 to the power 2", or "800 998 squared".
The square of 800 998 is 641 597 796 004 because 800 998 × 800 998 = 800 9982 = 641 597 796 004.
As a consequence, 800 998 is the square root of 641 597 796 004.
The multiples of 800 998 are all integers evenly divisible by 800 998, that is all numbers such that the remainder of the division by 800 998 is zero. There are infinitely many multiples of 800 998. The smallest multiples of 800 998 are: