Q: Is 3,978,921 a Composite Number?
A: Yes, 3,978,921 is a composite number.
The number 3,978,921 can be evenly divided by 1 3 1,326,307 and 3,978,921, with no remainder.
Since 3,978,921 cannot be divided by just 1 and 3,978,921, it is a composite number.