Q: Is 21,248 a Prime Number?
A: No, 21,248 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 21248 can be evenly divided by 1 2 4 8 16 32 64 83 128 166 256 332 664 1,328 2,656 5,312 10,624 and 21,248, with no remainder.
Since 21,248 cannot be divided by just 1 and 21,248, it is not a prime number.