Defines prime and composite numbers, factors and factoring, complete factoring, factor pairs, factor triples, the power of a number, exponents and prime factorizations. Explains the Fundamental Theorem of Arithmetic, the Sieve of Eratosthenes and how to use them to not only find primes, but also determine if a number is prime. Other topics included are balance in factor pairs, Highest Common Factor (HCF), Greatest Common Divisor (GCD), relatively prime numbers, common multiple, Least Common Multiple (LCM) and how to determine if a number is prime or composite. 60 problems solved in detail, with explanations. Includes a topic-specific glossary, reference, index and lists of the first 600 prime numbers and prime factorizations of the first 300 natural numbers.