Q: Is 1,221,678 a Prime Number?
A: No, 1,221,678 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 1221678 can be evenly divided by 1 2 3 6 9 18 67 134 201 402 603 1,013 1,206 2,026 3,039 6,078 9,117 18,234 67,871 135,742 203,613 407,226 610,839 and 1,221,678, with no remainder.
Since 1,221,678 cannot be divided by just 1 and 1,221,678, it is not a prime number.