Q: Is 640,005 a Composite Number?
A: Yes, 640,005 is a composite number.
The number 640,005 can be evenly divided by 1 3 5 15 42,667 128,001 213,335 and 640,005, with no remainder.
Since 640,005 cannot be divided by just 1 and 640,005, it is a composite number.