Q: Is 21,536 a Prime Number?
A: No, 21,536 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 21536 can be evenly divided by 1 2 4 8 16 32 673 1,346 2,692 5,384 10,768 and 21,536, with no remainder.
Since 21,536 cannot be divided by just 1 and 21,536, it is not a prime number.