Divisibility
Topics
- Prime and Composite NumbersPro
- Divisibility RulesPro
- Prime Factorization of Numbers (Divisors)Pro
- GCD and LCM of Several NumbersPro
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Prime and Composite Numbers
- A prime is divisible only by 1 and itself; a composite has more divisors. To test, hunt for a divisor up to the square root.
- 1001 — prime or composite? 1001 = 7·11·13 — big ≠ prime.
- How many primes from 1 to 10? Primes up to 10: 2, 3, 5, 7.
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