Q: Is 21,488 a Prime Number?
A: No, 21,488 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 21488 can be evenly divided by 1 2 4 8 16 17 34 68 79 136 158 272 316 632 1,264 1,343 2,686 5,372 10,744 and 21,488, with no remainder.
Since 21,488 cannot be divided by just 1 and 21,488, it is not a prime number.