Pythagoras is not a very good mathematician

MayCaesar

Pythagorean theorem, strictly speaking and according to historical sciences, was known long before Pythagoras. It is not rare that a certain statement is prescribed to someone who in reality did not come up with it first, but, rather, showed how it can be used in a large variety of applications. For example, Newton was not the first to note that force defines acceleration, not velocity - however, Newton compiled this and a few other statements and built a sound system out of them that laid down the ground for modern mechanics.

Pythagoras, for example, pretty much defined the direction of the world music by defining Pythagorean intervals - the foundation is still used by pretty much every modern musician. Pythagoras also may have been the first scientist in Ancient Greece who started championing the idea of non-flat Earth: although that Earth is not flat was known pretty well at the time, Pythagoras, again, built a theory on why it could be spherical.

Pythagoras also had pretty comprehensive social and political views. The concepts which are widely known nowadays, such as healthy diet and exercise, meditations and walks in order to achieve harmony with nature, were not properly systematized before Pythagoras - who made them into one large field, who came up with the "healthy lifestyle" as we know it.

In conclusion, it is important to understand that Pythagoras is not a discoverer; Pythagoras is a classifier and systematizer. He was exceptionally intelligent, but his intelligence was the strongest in his ability to find connections between known facts, rather than to find new facts. He is not Socrates or Plato, but he is somewhat similar to Aristotle.