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A prime has exactly two factors: 1 and itself. Find factors in pairs so none are missed, break a number into primes by dividing by the smallest prime that works, and remember that 1 is not a prime and 2 is the only even prime.
✓ You passed this topic’s test.
Factors come in pairs — “every factor below the square root has a partner above it”
Use it for: Factor, prime, HCF-style and “how many primes” questions in Class 5–9 Olympiad papers.
Check: 36 = 2² × 3², and (2 + 1) × (2 + 1) = 9 factors ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 💎 Prime Hunter badge when you pass — and a certificate when you finish all 13 topics of Part 4 · Class 5–10 problem solving. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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