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Check if a number is prime.

Python/Codingeasy0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
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1,863
across 7 categories
Asked at these companies
HashedIn
Interview Pro Tip

Pro-Move: Miller-Rabin for large n. Red Flag: Trial division for 10^18.

Expert AnswerPremium
40 wordsInterview-ready
**Logic:** Prime if no divisor in [2, √n]. **Code:** `for i in range(2, int(n**0.5)+1): if n%i==0: return False`. O(√n). **Optimize:** Check 2, then odds. **Large n:** Miller-Rabin probabilistic. **Why:** Validation, sampling....
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