It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 398 638 is not a prime number.
For example, 800 398 638 can be divided by 2: 800 398 638 / 2 = 400 199 319.
For 800 398 638 to be a prime number, it would have been required that 800 398 638 has only two divisors, i.e., itself and 1.
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800 398 638 is an even number, because it is evenly divisible by 2: 800 398 638 / 2 = 400 199 319.
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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 800 398 638 is about 28 291.317.
Thus, the square root of 800 398 638 is not an integer, and therefore 800 398 638 is not a square number.
The square of a number (here 800 398 638) is the result of the product of this number (800 398 638) by itself (i.e., 800 398 638 × 800 398 638); the square of 800 398 638 is sometimes called "raising 800 398 638 to the power 2", or "800 398 638 squared".
The square of 800 398 638 is 640 637 979 712 255 104 because 800 398 638 × 800 398 638 = 800 398 6382 = 640 637 979 712 255 104.
As a consequence, 800 398 638 is the square root of 640 637 979 712 255 104.
800 398 638 is a number with 9 digits.
The multiples of 800 398 638 are all integers evenly divisible by 800 398 638, that is all numbers such that the remainder of the division by 800 398 638 is zero. There are infinitely many multiples of 800 398 638. The smallest multiples of 800 398 638 are: