It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 777 729 is not a prime number.
For example, 777 729 can be divided by 3: 777 729 / 3 = 259 243.
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For 777 729 to be a prime number, it would have been required that 777 729 has only two divisors, i.e., itself and 1.
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777 729 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 777 729 is about 881.889.
Thus, the square root of 777 729 is not an integer, and therefore 777 729 is not a square number.
The square of a number (here 777 729) is the result of the product of this number (777 729) by itself (i.e., 777 729 × 777 729); the square of 777 729 is sometimes called "raising 777 729 to the power 2", or "777 729 squared".
The square of 777 729 is 604 862 397 441 because 777 729 × 777 729 = 777 7292 = 604 862 397 441.
As a consequence, 777 729 is the square root of 604 862 397 441.
The multiples of 777 729 are all integers evenly divisible by 777 729, that is all numbers such that the remainder of the division by 777 729 is zero. There are infinitely many multiples of 777 729. The smallest multiples of 777 729 are: