Q: Is 1,218,135 a Prime Number?
A: No, 1,218,135 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 1218135 can be evenly divided by 1 3 5 15 17 51 85 255 281 289 843 867 1,405 1,445 4,215 4,335 4,777 14,331 23,885 71,655 81,209 243,627 406,045 and 1,218,135, with no remainder.
Since 1,218,135 cannot be divided by just 1 and 1,218,135, it is not a prime number.