Q: Is 64,640 a Prime Number?
A: No, 64,640 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 64640 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 101 128 160 202 320 404 505 640 808 1,010 1,616 2,020 3,232 4,040 6,464 8,080 12,928 16,160 32,320 and 64,640, with no remainder.
Since 64,640 cannot be divided by just 1 and 64,640, it is not a prime number.