Q: Is 421,545 a Prime Number?
A: No, 421,545 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 421545 can be evenly divided by 1 3 5 15 157 179 471 537 785 895 2,355 2,685 28,103 84,309 140,515 and 421,545, with no remainder.
Since 421,545 cannot be divided by just 1 and 421,545, it is not a prime number.