Q: Is 21,700 a Prime Number?
A: No, 21,700 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 21700 can be evenly divided by 1 2 4 5 7 10 14 20 25 28 31 35 50 62 70 100 124 140 155 175 217 310 350 434 620 700 775 868 1,085 1,550 2,170 3,100 4,340 5,425 10,850 and 21,700, with no remainder.
Since 21,700 cannot be divided by just 1 and 21,700, it is not a prime number.