It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 774 016 809 is not a prime number.
For example, 774 016 809 can be divided by 3: 774 016 809 / 3 = 258 005 603.
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For 774 016 809 to be a prime number, it would have been required that 774 016 809 has only two divisors, i.e., itself and 1.
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774 016 809 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 774 016 809 is about 27 821.158.
Thus, the square root of 774 016 809 is not an integer, and therefore 774 016 809 is not a square number.
The square of a number (here 774 016 809) is the result of the product of this number (774 016 809) by itself (i.e., 774 016 809 × 774 016 809); the square of 774 016 809 is sometimes called "raising 774 016 809 to the power 2", or "774 016 809 squared".
The square of 774 016 809 is 599 102 020 614 542 464 because 774 016 809 × 774 016 809 = 774 016 8092 = 599 102 020 614 542 464.
As a consequence, 774 016 809 is the square root of 599 102 020 614 542 464.
774 016 809 is a number with 9 digits.
The multiples of 774 016 809 are all integers evenly divisible by 774 016 809, that is all numbers such that the remainder of the division by 774 016 809 is zero. There are infinitely many multiples of 774 016 809. The smallest multiples of 774 016 809 are: