Q: Is 1,720,221 a Prime Number?
A: No, 1,720,221 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 1720221 can be evenly divided by 1 3 31 53 93 159 349 1,047 1,643 4,929 10,819 18,497 32,457 55,491 573,407 and 1,720,221, with no remainder.
Since 1,720,221 cannot be divided by just 1 and 1,720,221, it is not a prime number.