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Year 6 · Multiplication
Prime and composite numbers
A prime number has exactly two factors: 1 and itself. Composite numbers have more.
How to do it
- Try dividing by 2, 3, 5, 7… up to its square root.
- If nothing divides it, it is prime.
- Prime factorisation: keep dividing by the smallest prime.
Worked example
Is 14 prime or composite?
14 = 2 × 7, so it has other factors: composite.
Answer: Composite
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Watch out1 is not prime. 2 is the only even prime.
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