Q: Is 666,240 a Prime Number?
A: No, 666,240 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 666240 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 64 80 96 120 128 160 192 240 320 347 384 480 640 694 960 1,041 1,388 1,735 1,920 2,082 2,776 3,470 4,164 5,205 5,552 6,940 8,328 10,410 11,104 13,880 16,656 20,820 22,208 27,760 33,312 41,640 44,416 55,520 66,624 83,280 111,040 133,248 166,560 222,080 333,120 and 666,240, with no remainder.
Since 666,240 cannot be divided by just 1 and 666,240, it is not a prime number.