Q: Is 647,216 a Prime Number?
A: No, 647,216 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 647216 can be evenly divided by 1 2 4 8 16 19 38 76 152 304 2,129 4,258 8,516 17,032 34,064 40,451 80,902 161,804 323,608 and 647,216, with no remainder.
Since 647,216 cannot be divided by just 1 and 647,216, it is not a prime number.