Q: Is 642,240 a Prime Number?
A: No, 642,240 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 642240 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 64 72 80 90 96 120 144 160 180 192 223 240 288 320 360 446 480 576 669 720 892 960 1,115 1,338 1,440 1,784 2,007 2,230 2,676 2,880 3,345 3,568 4,014 4,460 5,352 6,690 7,136 8,028 8,920 10,035 10,704 13,380 14,272 16,056 17,840 20,070 21,408 26,760 32,112 35,680 40,140 42,816 53,520 64,224 71,360 80,280 107,040 128,448 160,560 214,080 321,120 and 642,240, with no remainder.
Since 642,240 cannot be divided by just 1 and 642,240, it is not a prime number.