Q: Is 3,121,991 a Prime Number?
A: No, 3,121,991 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 3121991 can be evenly divided by 1 73 42,767 and 3,121,991, with no remainder.
Since 3,121,991 cannot be divided by just 1 and 3,121,991, it is not a prime number.