It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 805 509 464 is not a prime number.
For example, 805 509 464 can be divided by 2: 805 509 464 / 2 = 402 754 732.
For 805 509 464 to be a prime number, it would have been required that 805 509 464 has only two divisors, i.e., itself and 1.
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805 509 464 is an even number, because it is evenly divisible by 2: 805 509 464 / 2 = 402 754 732.
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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 805 509 464 is about 28 381.499.
Thus, the square root of 805 509 464 is not an integer, and therefore 805 509 464 is not a square number.
The square of a number (here 805 509 464) is the result of the product of this number (805 509 464) by itself (i.e., 805 509 464 × 805 509 464); the square of 805 509 464 is sometimes called "raising 805 509 464 to the power 2", or "805 509 464 squared".
The square of 805 509 464 is 648 845 496 593 567 232 because 805 509 464 × 805 509 464 = 805 509 4642 = 648 845 496 593 567 232.
As a consequence, 805 509 464 is the square root of 648 845 496 593 567 232.
805 509 464 is a number with 9 digits.
The multiples of 805 509 464 are all integers evenly divisible by 805 509 464, that is all numbers such that the remainder of the division by 805 509 464 is zero. There are infinitely many multiples of 805 509 464. The smallest multiples of 805 509 464 are: