It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 018 is not a prime number.
For example, 800 018 can be divided by 2: 800 018 / 2 = 400 009.
For 800 018 to be a prime number, it would have been required that 800 018 has only two divisors, i.e., itself and 1.
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800 018 is an even number, because it is evenly divisible by 2: 800 018 / 2 = 400 009.
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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 800 018 is about 894.437.
Thus, the square root of 800 018 is not an integer, and therefore 800 018 is not a square number.
The square of a number (here 800 018) is the result of the product of this number (800 018) by itself (i.e., 800 018 × 800 018); the square of 800 018 is sometimes called "raising 800 018 to the power 2", or "800 018 squared".
The square of 800 018 is 640 028 800 324 because 800 018 × 800 018 = 800 0182 = 640 028 800 324.
As a consequence, 800 018 is the square root of 640 028 800 324.
The multiples of 800 018 are all integers evenly divisible by 800 018, that is all numbers such that the remainder of the division by 800 018 is zero. There are infinitely many multiples of 800 018. The smallest multiples of 800 018 are: