They have not won the RWC at all up to 17/09/2011
They have played 7 times
10
Three
Ireland have won 7 times out of 7 meetings against the USA
Ireland is 32,525 square miles. New Zealand is 103,483 square miles. Ireland could fit in the country of New Zealand 3 times.
twice
99
3
all six times
Twice. In 1987 and in 2011.
Up to 2011, Ireland and France have contested 89 rugby matches. France have won 55 matches. Ireland have won 29 matches. There have been 5 drawn matches.
Ireland has many rugby teams. However, what you are probably referring to is why there is not a Republic of Ireland and a Northern Ireland team. The reason is that, like many sports in Ireland, rugby is played on an all-Ireland basis and there one organisation that looks after it, the Irish Rugby Football Union, and so there is one international team.