It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 888 is not a prime number.
For example, 800 888 can be divided by 2: 800 888 / 2 = 400 444.
For 800 888 to be a prime number, it would have been required that 800 888 has only two divisors, i.e., itself and 1.
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800 888 is an even number, because it is evenly divisible by 2: 800 888 / 2 = 400 444.
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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 800 888 is about 894.923.
Thus, the square root of 800 888 is not an integer, and therefore 800 888 is not a square number.
The square of a number (here 800 888) is the result of the product of this number (800 888) by itself (i.e., 800 888 × 800 888); the square of 800 888 is sometimes called "raising 800 888 to the power 2", or "800 888 squared".
The square of 800 888 is 641 421 588 544 because 800 888 × 800 888 = 800 8882 = 641 421 588 544.
As a consequence, 800 888 is the square root of 641 421 588 544.
The multiples of 800 888 are all integers evenly divisible by 800 888, that is all numbers such that the remainder of the division by 800 888 is zero. There are infinitely many multiples of 800 888. The smallest multiples of 800 888 are: