Q: Is 21,744 a Prime Number?
A: No, 21,744 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 21744 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 36 48 72 144 151 302 453 604 906 1,208 1,359 1,812 2,416 2,718 3,624 5,436 7,248 10,872 and 21,744, with no remainder.
Since 21,744 cannot be divided by just 1 and 21,744, it is not a prime number.