Q: Is 6,400 a Prime Number?
A: No, 6,400 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 6400 can be evenly divided by 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 128 160 200 256 320 400 640 800 1,280 1,600 3,200 and 6,400, with no remainder.
Since 6,400 cannot be divided by just 1 and 6,400, it is not a prime number.