Q: Is 421,815 a Prime Number?
A: No, 421,815 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 421815 can be evenly divided by 1 3 5 15 61 183 305 461 915 1,383 2,305 6,915 28,121 84,363 140,605 and 421,815, with no remainder.
Since 421,815 cannot be divided by just 1 and 421,815, it is not a prime number.