Q: Is 1,200,003 a Prime Number?
A: No, 1,200,003 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 1200003 can be evenly divided by 1 3 7 21 57,143 171,429 400,001 and 1,200,003, with no remainder.
Since 1,200,003 cannot be divided by just 1 and 1,200,003, it is not a prime number.