It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 494 478 is not a prime number.
For example, 800 494 478 can be divided by 2: 800 494 478 / 2 = 400 247 239.
For 800 494 478 to be a prime number, it would have been required that 800 494 478 has only two divisors, i.e., itself and 1.
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800 494 478 is an even number, because it is evenly divisible by 2: 800 494 478 / 2 = 400 247 239.
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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 800 494 478 is about 28 293.011.
Thus, the square root of 800 494 478 is not an integer, and therefore 800 494 478 is not a square number.
The square of a number (here 800 494 478) is the result of the product of this number (800 494 478) by itself (i.e., 800 494 478 × 800 494 478); the square of 800 494 478 is sometimes called "raising 800 494 478 to the power 2", or "800 494 478 squared".
The square of 800 494 478 is 640 791 409 308 492 544 because 800 494 478 × 800 494 478 = 800 494 4782 = 640 791 409 308 492 544.
As a consequence, 800 494 478 is the square root of 640 791 409 308 492 544.
800 494 478 is a number with 9 digits.
The multiples of 800 494 478 are all integers evenly divisible by 800 494 478, that is all numbers such that the remainder of the division by 800 494 478 is zero. There are infinitely many multiples of 800 494 478. The smallest multiples of 800 494 478 are: