It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 398 674 is not a prime number.
For example, 800 398 674 can be divided by 2: 800 398 674 / 2 = 400 199 337.
For 800 398 674 to be a prime number, it would have been required that 800 398 674 has only two divisors, i.e., itself and 1.
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800 398 674 is an even number, because it is evenly divisible by 2: 800 398 674 / 2 = 400 199 337.
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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 800 398 674 is about 28 291.318.
Thus, the square root of 800 398 674 is not an integer, and therefore 800 398 674 is not a square number.
The square of a number (here 800 398 674) is the result of the product of this number (800 398 674) by itself (i.e., 800 398 674 × 800 398 674); the square of 800 398 674 is sometimes called "raising 800 398 674 to the power 2", or "800 398 674 squared".
The square of 800 398 674 is 640 638 037 340 958 336 because 800 398 674 × 800 398 674 = 800 398 6742 = 640 638 037 340 958 336.
As a consequence, 800 398 674 is the square root of 640 638 037 340 958 336.
800 398 674 is a number with 9 digits.
The multiples of 800 398 674 are all integers evenly divisible by 800 398 674, that is all numbers such that the remainder of the division by 800 398 674 is zero. There are infinitely many multiples of 800 398 674. The smallest multiples of 800 398 674 are: