It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 423 is not a prime number.
For example, 800 423 can be divided by 13: 800 423 / 13 = 61 571.
For 800 423 to be a prime number, it would have been required that 800 423 has only two divisors, i.e., itself and 1.
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800 423 is an odd number, because it is not evenly divisible by 2.
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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 800 423 is about 894.664.
Thus, the square root of 800 423 is not an integer, and therefore 800 423 is not a square number.
The square of a number (here 800 423) is the result of the product of this number (800 423) by itself (i.e., 800 423 × 800 423); the square of 800 423 is sometimes called "raising 800 423 to the power 2", or "800 423 squared".
The square of 800 423 is 640 676 978 929 because 800 423 × 800 423 = 800 4232 = 640 676 978 929.
As a consequence, 800 423 is the square root of 640 676 978 929.
The multiples of 800 423 are all integers evenly divisible by 800 423, that is all numbers such that the remainder of the division by 800 423 is zero. There are infinitely many multiples of 800 423. The smallest multiples of 800 423 are: