Q: Is 21,424 a Prime Number?
A: No, 21,424 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 21424 can be evenly divided by 1 2 4 8 13 16 26 52 103 104 206 208 412 824 1,339 1,648 2,678 5,356 10,712 and 21,424, with no remainder.
Since 21,424 cannot be divided by just 1 and 21,424, it is not a prime number.