This conversion is almost exclusively used in theoretical or highly specialized scientific contexts where extremely small distances need to be compared to immense cosmic scales, though the practical result for 10,000,000 millimeters is essentially zero light-years.

A light-year is a unit of astronomical distance, representing the distance that light travels in vacuum in one Julian year.

10,000,000 millimeters is equal to 10 kilometers, which is a very small distance in astronomical terms.

For practical purposes, yes, it indicates that 10,000,000 millimeters is infinitesimally small when compared to the vast distances measured in light-years. The actual value is extremely close to zero.