It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 804 022 728 is not a prime number.
For example, 804 022 728 can be divided by 2: 804 022 728 / 2 = 402 011 364.
For 804 022 728 to be a prime number, it would have been required that 804 022 728 has only two divisors, i.e., itself and 1.
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804 022 728 is an even number, because it is evenly divisible by 2: 804 022 728 / 2 = 402 011 364.
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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 804 022 728 is about 28 355.295.
Thus, the square root of 804 022 728 is not an integer, and therefore 804 022 728 is not a square number.
The square of a number (here 804 022 728) is the result of the product of this number (804 022 728) by itself (i.e., 804 022 728 × 804 022 728); the square of 804 022 728 is sometimes called "raising 804 022 728 to the power 2", or "804 022 728 squared".
The square of 804 022 728 is 646 452 547 140 561 920 because 804 022 728 × 804 022 728 = 804 022 7282 = 646 452 547 140 561 920.
As a consequence, 804 022 728 is the square root of 646 452 547 140 561 920.
804 022 728 is a number with 9 digits.
The multiples of 804 022 728 are all integers evenly divisible by 804 022 728, that is all numbers such that the remainder of the division by 804 022 728 is zero. There are infinitely many multiples of 804 022 728. The smallest multiples of 804 022 728 are: