Q: Is 1,720,621 a Prime Number?
A: No, 1,720,621 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 1720621 can be evenly divided by 1 7 17 19 119 133 323 761 2,261 5,327 12,937 14,459 90,559 101,213 245,803 and 1,720,621, with no remainder.
Since 1,720,621 cannot be divided by just 1 and 1,720,621, it is not a prime number.