It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 671 486 is not a prime number.
For example, 800 671 486 can be divided by 2: 800 671 486 / 2 = 400 335 743.
For 800 671 486 to be a prime number, it would have been required that 800 671 486 has only two divisors, i.e., itself and 1.
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800 671 486 is an even number, because it is evenly divisible by 2: 800 671 486 / 2 = 400 335 743.
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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 800 671 486 is about 28 296.139.
Thus, the square root of 800 671 486 is not an integer, and therefore 800 671 486 is not a square number.
The square of a number (here 800 671 486) is the result of the product of this number (800 671 486) by itself (i.e., 800 671 486 × 800 671 486); the square of 800 671 486 is sometimes called "raising 800 671 486 to the power 2", or "800 671 486 squared".
The square of 800 671 486 is 641 074 828 493 448 192 because 800 671 486 × 800 671 486 = 800 671 4862 = 641 074 828 493 448 192.
As a consequence, 800 671 486 is the square root of 641 074 828 493 448 192.
800 671 486 is a number with 9 digits.
The multiples of 800 671 486 are all integers evenly divisible by 800 671 486, that is all numbers such that the remainder of the division by 800 671 486 is zero. There are infinitely many multiples of 800 671 486. The smallest multiples of 800 671 486 are: