Q: Is 21,804 a Prime Number?
A: No, 21,804 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 21804 can be evenly divided by 1 2 3 4 6 12 23 46 69 79 92 138 158 237 276 316 474 948 1,817 3,634 5,451 7,268 10,902 and 21,804, with no remainder.
Since 21,804 cannot be divided by just 1 and 21,804, it is not a prime number.