find . -name "*prop*"
.: represents the current folder.
-name: option to find files by name.
*prop*: filenames that contain the word prop.
OR as mentioned by @alexs on the comment, you can use:
find . -iname "*prop*"
-iname: option to find files by name but is case insensitive.
If you want to find the all files with the root folder as the stating place, do as mentioned by @IrfanLatif by using:
find / -iname "*prop*"