Q: Is 42,640 a Prime Number?
A: No, 42,640 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 42640 can be evenly divided by 1 2 4 5 8 10 13 16 20 26 40 41 52 65 80 82 104 130 164 205 208 260 328 410 520 533 656 820 1,040 1,066 1,640 2,132 2,665 3,280 4,264 5,330 8,528 10,660 21,320 and 42,640, with no remainder.
Since 42,640 cannot be divided by just 1 and 42,640, it is not a prime number.