Q: Is 21,450 a Prime Number?
A: No, 21,450 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 21450 can be evenly divided by 1 2 3 5 6 10 11 13 15 22 25 26 30 33 39 50 55 65 66 75 78 110 130 143 150 165 195 275 286 325 330 390 429 550 650 715 825 858 975 1,430 1,650 1,950 2,145 3,575 4,290 7,150 10,725 and 21,450, with no remainder.
Since 21,450 cannot be divided by just 1 and 21,450, it is not a prime number.