https://books.google.com/books/about/The_Fundamental_Theorem_of_Arithmetic.html?id=wati0AEACAAJ Dec 20, 2023 ... For example, the numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, etc, are composite numbers. The prime number 7 is divided by 1 and 7 only, ...