Prolog was the first programming language I was taught at university. I’m not sure it was the best introduction to programming as it’s quite different from most other languages. I think it expressed the high-brow attitude of the lecturer.
It could just be my bias, but everyone I have met who did some Prolog after Java and C said they found Prolog difficult.
None of my fellow Prolog-first cohort seemed to have any problems with other languages.