2, because 2 + 2 = 2*2 = 2^2, it's also the smallest prime number, only even prime number and etc
My favourite number altogether is 252, for no reason. I just like it for some reason.
From 1 to 10 what is your favourite numbet
1 - 2
2 - 4
3 - 6
4 - 3
5 - 1
6 - 9
7 - 10
8 - 5
9 - 7
10 - 8