Yes cucumber soup can be frozen.
Freezing cucumber soup will make the cucumber soup last longer than just refrigerating the cucumber soup.
If you refrigerate cucumber soup the cucumber soup will last for maybe a week before the cucumber soup goes bad.
But when cucumber soup is frozen it will last up to a year and sometimes longer but the longer the cucumber soup remains in the freezer the less fresh it becomes.
You can put cucumber soup into a freezer safe container or even butter containers, whip cream containers or other containers that food comes in.
Then just place the cucumber soup in the freezer.
Or you can put cucumber soup into freezer bags and freeze the cucumber soup that way as well.