Change Precision of Double Number

Hello. I have numbers in a dataset that look like this: 1.6199999999999974

I want to reduce the precision to 3 decimal places. I saw there is a format function for strings, but didn't see anything similar for numbers. What is the best way to reduce the precision to 3 decimal places? Do I need to use a script for that? If so, can you help me with what it might look like?

Thanks for your help.