What early abilities showed that John von Neumann was a child prodigy?

John von Neumann displayed signs of genius from a very early age, demonstrating remarkable intellectual abilities that marked him as a child prodigy.12

Key indicators of his early talent included:

• Linguistic Ability: By the age of six, he was already capable of joking with his father in Classical Greek.13
• Exceptional Memory: As a young child, he possessed an extraordinary capacity for memorization. He would often perform a party trick where he memorized pages from a telephone book, allowing him to recite the names, numbers, and addresses contained on a page or answer specific questions about them.13

These early displays of mental power were the precursors to his later life, where he became one of the most influential mathematicians of the 20th century, making foundational contributions to fields such as quantum theory, game theory, and computer science.23