Q: Is 21,750 a Prime Number?
A: No, 21,750 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 21750 can be evenly divided by 1 2 3 5 6 10 15 25 29 30 50 58 75 87 125 145 150 174 250 290 375 435 725 750 870 1,450 2,175 3,625 4,350 7,250 10,875 and 21,750, with no remainder.
Since 21,750 cannot be divided by just 1 and 21,750, it is not a prime number.