Q: Is 642,620 a Prime Number?
A: No, 642,620 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 642620 can be evenly divided by 1 2 4 5 10 11 20 22 23 44 46 55 92 110 115 127 220 230 253 254 460 506 508 635 1,012 1,265 1,270 1,397 2,530 2,540 2,794 2,921 5,060 5,588 5,842 6,985 11,684 13,970 14,605 27,940 29,210 32,131 58,420 64,262 128,524 160,655 321,310 and 642,620, with no remainder.
Since 642,620 cannot be divided by just 1 and 642,620, it is not a prime number.