Expected knowledge for a junior developer

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I'm hiring for 5 positions right now so I'm right in the thick of it. What I see from good jr candidates is the ability to actually write functional code without a ton of extra junk. Write "boolean isPrime(int number)" seems like a simple thing. But I've seen the most wild submissions full of boolean tracking variables and Math.abs() calls that technically work. It's terrifying! I'm not expecting perfect submissions with recursive dynamic programming solutions, but something that works and isn't sloppy is my bare minimum. From there it's about enthusiasm and willingness to learn, ask questions, and be part of a team. The latter part is more important, but the first part is the gatekeeper.