There is only one real pope at a time.
In history there have been what are called "anit-popes" which are men that claim to be pope but are have not been elected to lead the church by the College of Cardinals. There have been 40 anitpopes in history with the most recent being in 1447, Felix V.
When the present pope, Benedict XVI, picked his name Catholic thought it curious because many of the antipopes where Benedicts and popes decided against it to pick the name for that reason
There is only one reigning pope at a time in the Catholic Church but there have been 266 popes over history.
Including the current pope, Benedict XVI, there have been 265 popes.
That question can not be answered because we have no idea when the end of time will come.
There is only one pope and in 2014 that is Pope Francis. We also have Pope Emeritus Benedict XVI who continues to reside in the Vatican but has no papal duties.
There have been no popes named Kenneth.
There have been no popes named Jude.
217 popes have been born in Italy.
196 popes have come from Italy.
I am sure there are many popes in Heaven but am equally sure that there are a number of popes burning in hell.
There have been 8 popes called Urban.
There were 38 popes before Anastasius I.
There have been 6 popes named Sixtus.
There have been 13 popes named Leo.
Roman Catholic Popes are descended from Peter, how can they be false? Please be more clear in your question and what you are referring to.
There have been 13 popes named Innocent.
There have been 217 Italian popes and only 49 non-Italian popes.