Q: Is 646,400 a Prime Number?
A: No, 646,400 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 646400 can be evenly divided by 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 101 128 160 200 202 256 320 400 404 505 640 800 808 1,010 1,280 1,600 1,616 2,020 2,525 3,200 3,232 4,040 5,050 6,400 6,464 8,080 10,100 12,928 16,160 20,200 25,856 32,320 40,400 64,640 80,800 129,280 161,600 323,200 and 646,400, with no remainder.
Since 646,400 cannot be divided by just 1 and 646,400, it is not a prime number.