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What is my number? Here are five clues to help you: 1. I am a one-digit number. 2. I am an odd number. 3. I have a start and an end, but no curves. 4. I have two of the letter “e” in my name. 5. I am a prime number (a number that cannot be divided into equal groups). Did you figure it out? Don't give up. Eliminate the impossible and what you have left is the answer. This is just one of the problems in this book that you will face. Do you know about square numbers, or triangular numbers, or cube numbers, or prime numbers? Do you know what a "perfect number" is? Well, you will discover more about these advanced mathematical concepts if you explore this book.