|Pi is infinite, so is this article.|
Though pi is one of the best known irrational numbers in the world, there are other less-known irrational numbers that are still interesting to learn about.
One of the first numbers that comes to my mind other than pi when somebody says "irrational number" is phi. We have a whole page on phi to learn more about it. Click on this link to learn more about phi.
Non-perfect Squares Edit
Though this isn't a single irrational number, non-perfect squares are any two same numbers that when multiplied, give a whole number. Non-perfect squares are always irrational, though, instead of perfect squares, which are always whole numbers. The interesting thing is, any non-perfect square is irrational.