The pyramids of Egypt, particularly the Pyramid of Khufu (the Great Pyramid) and others from the Old Kingdom period, are monuments built primarily as tombs for pharaohs. While they are closely associated with ancient Egyptian culture, they were not the first way of discovering hieroglyphics.
Hieroglyphics is one of the earliest writing systems, and it began to appear in Egypt around 3100 BCE, well before the construction of the pyramids began in the 27th century BCE. The earliest examples of hieroglyphics are found on pottery and other artifacts, as well as on the Narmer Palette, which commemorates the unification of Upper and Lower Egypt.
The pyramids themselves do contain hieroglyphics, particularly in the form of inscriptions and spells related to the funerary practices of the ancient Egyptians. These texts, such as those found in the Pyramid Texts, provide valuable insights into the beliefs and practices of the time.
In summary, while the pyramids include hieroglyphic writing, the system of hieroglyphics predates the pyramids and was already in use by the time they were constructed.