Q: Is 666,720 a Prime Number?
A: No, 666,720 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 666720 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 72 80 90 96 120 144 160 180 240 288 360 463 480 720 926 1,389 1,440 1,852 2,315 2,778 3,704 4,167 4,630 5,556 6,945 7,408 8,334 9,260 11,112 13,890 14,816 16,668 18,520 20,835 22,224 27,780 33,336 37,040 41,670 44,448 55,560 66,672 74,080 83,340 111,120 133,344 166,680 222,240 333,360 and 666,720, with no remainder.
Since 666,720 cannot be divided by just 1 and 666,720, it is not a prime number.