Q: Is 21,900 a Prime Number?
A: No, 21,900 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 21900 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 25 30 50 60 73 75 100 146 150 219 292 300 365 438 730 876 1,095 1,460 1,825 2,190 3,650 4,380 5,475 7,300 10,950 and 21,900, with no remainder.
Since 21,900 cannot be divided by just 1 and 21,900, it is not a prime number.