Something like this:
int[] a = {3, 2147483646};
int[] b = {9, 4};
returns true...

Thnks - im already done it - im forget to use return

Impossible to tell without more details.

Isn't your loop running forever there?

You can change the variable names if you don't like them.

The real question is, why would you copy values from the description when your function has parameters - are those present for no reason?

Hm... Input data like nbYear(1_500_000, 2.5, -40_000, 2_000_000) seems to be valid according to this Kata conditions.
But population will never reach it goal, though...