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Check if a number is prime.

Python/Codingeasy0.2 min readPremium

**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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Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
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.

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This easy-level Python/Coding question appears frequently in data engineering interviews at companies like HashedIn. While less common, it tests deeper understanding that distinguishes strong candidates.

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Expert Answer
40 words

Logic: Prime if no divisor in [2, √n]. Code: for i in range(2, int(n0.5)+1): if n%i==0: return False. O(√n). Optimize: Check 2, then odds. Large n: Miller-Rabin probabilistic. Why: Validation, sampling. Production:** Use for bounded ranges; library for big numbers.

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According to DataEngPrep.tech, this is one of the most frequently asked Python/Coding interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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