Q: Is 1,221,003 a Prime Number?
A: No, 1,221,003 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 1221003 can be evenly divided by 1 3 7 9 21 63 19,381 58,143 135,667 174,429 407,001 and 1,221,003, with no remainder.
Since 1,221,003 cannot be divided by just 1 and 1,221,003, it is not a prime number.