The 6 Nations began in 2000, when Italy joined the 5 Nations championship. Since the 6 Nations came into existence and up to the end of the 2018 championship, Ireland has won it four times, in 2009, 2014, 2015 and 2018.
Going back to the 5 Nations and its various predecessors and including the 6 Nations, Ireland has won 14 championships, 8 of which they were joint winners.
The 6 Nations Championship only came into existence in 2000, when Italy joined the teams that competed for the 5 Nations Championship. Up to the end of the 2014 Championship, Ireland have won it twice. They won it in 2009 and again in 2014.
Note that the 2015 championship is ongoing at the time of answering the question (6th March 2015) and Ireland lead the championship with 2 matches remaining, having won all 3 of their opening games. They are now favourites to win the 2015 Championship.
Ireland won the 2009 six nations championship
Ireland
Ireland
they won 7 times the most ever
Cavan have never won the All-Ireland Hurling title.
Ireland won it three times in a row, in 1992, 1993 and 1994. They have won it seven times in total.
As of the 18th of May 2014, they have won it 17 times.
Down has never won the All-Ireland Hurling final.
As of 2011, Tyrone have never won the All-Ireland Hurling Championship.
Ireland have won 7 times out of 7 meetings against the USA
they have won 3 times since the 5 nations changed to the 6 nations
4 times.