Q: Is 421,724 a Prime Number?
A: No, 421,724 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 421724 can be evenly divided by 1 2 4 19 31 38 62 76 124 179 358 589 716 1,178 2,356 3,401 5,549 6,802 11,098 13,604 22,196 105,431 210,862 and 421,724, with no remainder.
Since 421,724 cannot be divided by just 1 and 421,724, it is not a prime number.