It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 204 is not a prime number.
For example, 800 204 can be divided by 2: 800 204 / 2 = 400 102.
For 800 204 to be a prime number, it would have been required that 800 204 has only two divisors, i.e., itself and 1.
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800 204 is an even number, because it is evenly divisible by 2: 800 204 / 2 = 400 102.
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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 800 204 is about 894.541.
Thus, the square root of 800 204 is not an integer, and therefore 800 204 is not a square number.
The square of a number (here 800 204) is the result of the product of this number (800 204) by itself (i.e., 800 204 × 800 204); the square of 800 204 is sometimes called "raising 800 204 to the power 2", or "800 204 squared".
The square of 800 204 is 640 326 441 616 because 800 204 × 800 204 = 800 2042 = 640 326 441 616.
As a consequence, 800 204 is the square root of 640 326 441 616.
The multiples of 800 204 are all integers evenly divisible by 800 204, that is all numbers such that the remainder of the division by 800 204 is zero. There are infinitely many multiples of 800 204. The smallest multiples of 800 204 are: