Q: Is 1,221,777 a Prime Number?
A: No, 1,221,777 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1221777 can be evenly divided by 1 3 9 27 37 111 333 999 1,223 3,669 11,007 33,021 45,251 135,753 407,259 and 1,221,777, with no remainder.
Since 1,221,777 cannot be divided by just 1 and 1,221,777, it is not a prime number.