Q: Is 221,840 a Prime Number?
A: No, 221,840 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 221840 can be evenly divided by 1 2 4 5 8 10 16 20 40 47 59 80 94 118 188 235 236 295 376 470 472 590 752 940 944 1,180 1,880 2,360 2,773 3,760 4,720 5,546 11,092 13,865 22,184 27,730 44,368 55,460 110,920 and 221,840, with no remainder.
Since 221,840 cannot be divided by just 1 and 221,840, it is not a prime number.