A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's a unit of astronomical distance.

1 million meters is equal to 1,000 kilometers.

Light-years measure immense cosmic distances. 1 million meters is a relatively short distance on this grand scale, hence the very small conversion value of 0.0000 light-years.

This specific conversion (1 million meters to 0.0000 light-years) is primarily useful in astronomy and astrophysics to grasp the vastness of space. For everyday distances, kilometers or miles are more practical.