Q: Is 221,440 a Prime Number?
A: No, 221,440 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 221440 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 173 256 320 346 640 692 865 1,280 1,384 1,730 2,768 3,460 5,536 6,920 11,072 13,840 22,144 27,680 44,288 55,360 110,720 and 221,440, with no remainder.
Since 221,440 cannot be divided by just 1 and 221,440, it is not a prime number.