Q: Is 642,560 a Prime Number?
A: No, 642,560 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 642560 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 251 256 320 502 512 640 1,004 1,255 1,280 2,008 2,510 2,560 4,016 5,020 8,032 10,040 16,064 20,080 32,128 40,160 64,256 80,320 128,512 160,640 321,280 and 642,560, with no remainder.
Since 642,560 cannot be divided by just 1 and 642,560, it is not a prime number.