Q: Is 421,784 a Prime Number?
A: No, 421,784 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 421784 can be evenly divided by 1 2 4 8 11 22 44 88 4,793 9,586 19,172 38,344 52,723 105,446 210,892 and 421,784, with no remainder.
Since 421,784 cannot be divided by just 1 and 421,784, it is not a prime number.