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1. Express each number as a product of its prime factors :

3. Find the LCM and HCF of the following integers by applying the prime factorization method.

4. Given that HCF (306, 657) = 9, find LCM (306, 657).

5. Check whether 6^{n} can end with the digit 0 for any natural number n.

6. Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers.