Q: Is 21,084 a Prime Number?
A: No, 21,084 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 21084 can be evenly divided by 1 2 3 4 6 7 12 14 21 28 42 84 251 502 753 1,004 1,506 1,757 3,012 3,514 5,271 7,028 10,542 and 21,084, with no remainder.
Since 21,084 cannot be divided by just 1 and 21,084, it is not a prime number.