Q: Is 640,072 a Prime Number?
A: No, 640,072 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 640072 can be evenly divided by 1 2 4 8 19 38 76 152 4,211 8,422 16,844 33,688 80,009 160,018 320,036 and 640,072, with no remainder.
Since 640,072 cannot be divided by just 1 and 640,072, it is not a prime number.