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Do I need to invest to become millionaire?
You're ignoring inflation. Even if we assume the ECB sticks to its 2% inflation  target, and your salary only rises in line with inflation, you will be saving considerably more in forty years' time than you are today. In fact, an interest rate of 2% and an inflation rate of 2% make the sums exceptionally easy. You need to save €25,000 per year in 2057 euros to be a millionaire by 2057, which is €11,322 in 2017 euros. Challenging, but achievable. Of course, you'll only be a millionaire in 2057 euros, which will be worth less than half as much as a euro is worth right now.