It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 804 is not a prime number.
For example, 800 804 can be divided by 2: 800 804 / 2 = 400 402.
For 800 804 to be a prime number, it would have been required that 800 804 has only two divisors, i.e., itself and 1.
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800 804 is an even number, because it is evenly divisible by 2: 800 804 / 2 = 400 402.
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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 800 804 is about 894.877.
Thus, the square root of 800 804 is not an integer, and therefore 800 804 is not a square number.
The square of a number (here 800 804) is the result of the product of this number (800 804) by itself (i.e., 800 804 × 800 804); the square of 800 804 is sometimes called "raising 800 804 to the power 2", or "800 804 squared".
The square of 800 804 is 641 287 046 416 because 800 804 × 800 804 = 800 8042 = 641 287 046 416.
As a consequence, 800 804 is the square root of 641 287 046 416.
The multiples of 800 804 are all integers evenly divisible by 800 804, that is all numbers such that the remainder of the division by 800 804 is zero. There are infinitely many multiples of 800 804. The smallest multiples of 800 804 are: