Time: 0:00
This is a logic errors bug
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: for n = 1 the loop has nothing to check, so the function reaches return True.
The fix: add if n < 2: return False at the top.
Remember: test the smallest inputs. A loop that never runs can give a wrong answer.
The pattern behind it: logic errors.
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<iframe src="https://trybughunt.com/embed/0f43e06f-a1eb-46cf-a513-9ab83f5af67f" title="Debugging challenge: Prime checker thinks 1 is prime" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
<p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/0f43e06f-a1eb-46cf-a513-9ab83f5af67f">BugHunt</a></p>