It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 426 is not a prime number.
For example, 800 426 can be divided by 2: 800 426 / 2 = 400 213.
For 800 426 to be a prime number, it would have been required that 800 426 has only two divisors, i.e., itself and 1.
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800 426 is an even number, because it is evenly divisible by 2: 800 426 / 2 = 400 213.
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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 800 426 is about 894.665.
Thus, the square root of 800 426 is not an integer, and therefore 800 426 is not a square number.
The square of a number (here 800 426) is the result of the product of this number (800 426) by itself (i.e., 800 426 × 800 426); the square of 800 426 is sometimes called "raising 800 426 to the power 2", or "800 426 squared".
The square of 800 426 is 640 681 781 476 because 800 426 × 800 426 = 800 4262 = 640 681 781 476.
As a consequence, 800 426 is the square root of 640 681 781 476.
The multiples of 800 426 are all integers evenly divisible by 800 426, that is all numbers such that the remainder of the division by 800 426 is zero. There are infinitely many multiples of 800 426. The smallest multiples of 800 426 are: