Q: Is 221,823 a Prime Number?
A: No, 221,823 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 221823 can be evenly divided by 1 3 7 9 21 49 63 147 441 503 1,509 3,521 4,527 10,563 24,647 31,689 73,941 and 221,823, with no remainder.
Since 221,823 cannot be divided by just 1 and 221,823, it is not a prime number.