Q: Is 2,638,721 a Prime Number?
A: No, 2,638,721 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 2638721 can be evenly divided by 1 23 47 1,081 2,441 56,143 114,727 and 2,638,721, with no remainder.
Since 2,638,721 cannot be divided by just 1 and 2,638,721, it is not a prime number.