Which would be richer an Irish millionaire or American one?

The answer to which millionaire is richer depends on the current exchange rate between the Euro and the US Dollar. As of my last knowledge update in September 2021, 1 Euro was approximately equal to 1.18 US Dollars. Based on this exchange rate, an Irish millionaire (with 1 million Euros) would have approximately 1.18 million US Dollars, making them slightly wealthier than an American millionaire (with 1 million US Dollars).

However, it's important to note that currency exchange rates can fluctuate over time, so the relative wealth of an Irish and American millionaire may change accordingly. To obtain the most up-to-date and accurate information, it's best to consult a reliable currency converter or financial news source.