What is Fermat’s last theorem and why it took mathematicians 3 centuries to solve it

In 1637, the French Pierre de Fermat wrote a conjecture on the margin of a page of the book “The Elements”, of Euclid.

This annotation, in which Fermat said he had no space to develop his wonderful proof, caused the most brilliant mathematicians to rake their brains for centuries to solve a problem that gradually became a myth.