Each ticket is made up of up to 100 shares, meaning you can buy a 1/100th single share of a ticket for €4.99 up to a full 1/1 share for €249.99.
Here’ an example:
If a ticket number wins the first prize, then the holder of a full ticket would win €4m. A player that holds only a single 1/100th share of that ticket would win 1/100th of the prize - €40,000.