It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 813 729 is not a prime number.
For example, 813 729 can be divided by 3: 813 729 / 3 = 271 243.
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For 813 729 to be a prime number, it would have been required that 813 729 has only two divisors, i.e., itself and 1.
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813 729 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 813 729 is about 902.069.
Thus, the square root of 813 729 is not an integer, and therefore 813 729 is not a square number.
The square of a number (here 813 729) is the result of the product of this number (813 729) by itself (i.e., 813 729 × 813 729); the square of 813 729 is sometimes called "raising 813 729 to the power 2", or "813 729 squared".
The square of 813 729 is 662 154 885 441 because 813 729 × 813 729 = 813 7292 = 662 154 885 441.
As a consequence, 813 729 is the square root of 662 154 885 441.
The multiples of 813 729 are all integers evenly divisible by 813 729, that is all numbers such that the remainder of the division by 813 729 is zero. There are infinitely many multiples of 813 729. The smallest multiples of 813 729 are: