Shop owner Ted Clifford expressed excitement, initially thinking the news was a prank, and highlighted his shop's previous success in selling winning tickets.
This €250 million prize is the largest ever EuroMillions win in Ireland and marks the 18th Irish jackpot winner.
The winner has already contacted the National Lottery, which will provide support for managing the significant sum.
Ted Clifford plans to use the €25,000 prize money awarded to the shop to host a 'big celebration' for his staff.