This is not an idiom. It means just what it seems to mean. It's a proverb. And it's also a sentence already.
My Favorite IDIOM Is, When Pigs Fly.
Idiom
To include an idiom in an example sentence, simply incorporate the idiom naturally into the sentence to convey a figurative meaning. For example, "She had a chip on her shoulder" is an idiom meaning she was easily offended or held a grudge.
An idiom usually is a sentence, or part of one. It certainly can be used as part of a sentence. The way to tell if it's an idiom is if it makes sense the way it's literally written.
The sentence is not, because an idiom is usually a phrase. The idiom is "do lunch," which means to have lunch together, usually while discussing business.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
That IS a sentence.
"Throw the book at him" IS a sentence.
yes
"Hit the books" is a sentence.
fall a prey