It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 016 is not a prime number.
For example, 800 016 can be divided by 2: 800 016 / 2 = 400 008.
For 800 016 to be a prime number, it would have been required that 800 016 has only two divisors, i.e., itself and 1.
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800 016 is an even number, because it is evenly divisible by 2: 800 016 / 2 = 400 008.
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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 800 016 is about 894.436.
Thus, the square root of 800 016 is not an integer, and therefore 800 016 is not a square number.
The square of a number (here 800 016) is the result of the product of this number (800 016) by itself (i.e., 800 016 × 800 016); the square of 800 016 is sometimes called "raising 800 016 to the power 2", or "800 016 squared".
The square of 800 016 is 640 025 600 256 because 800 016 × 800 016 = 800 0162 = 640 025 600 256.
As a consequence, 800 016 is the square root of 640 025 600 256.
The multiples of 800 016 are all integers evenly divisible by 800 016, that is all numbers such that the remainder of the division by 800 016 is zero. There are infinitely many multiples of 800 016. The smallest multiples of 800 016 are: