Q: Is 1,220,505 a Prime Number?
A: No, 1,220,505 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 1220505 can be evenly divided by 1 3 5 11 13 15 33 39 55 65 143 165 195 429 569 715 1,707 2,145 2,845 6,259 7,397 8,535 18,777 22,191 31,295 36,985 81,367 93,885 110,955 244,101 406,835 and 1,220,505, with no remainder.
Since 1,220,505 cannot be divided by just 1 and 1,220,505, it is not a prime number.