Here's how to convert millimeters to nanometers:

* There are 1,000,000 nanometers (nm) in 1 millimeter (mm).

* Therefore, to convert millimeters to nanometers, multiply by 1,000,000.

So, 2 millimeters is equal to:

2 mm * 1,000,000 nm/mm = 2,000,000 nanometers