In the Torah, there is a specific word for prayer: palal. The word only appears in the entirety of the Torah (the Five Books of Moses) 9 times in all!
Not a single one of those examples (G. 20:7, 17, 48:11, E. 21:22, N. 11:2, 21:7, D. 9:20, 26, 32:31) involves someone praying for themselves!
Instead, every case of someone praying was to intercede with G-d on someone else’s behalf! We have Avraham praying for Avimelech, Moshe praying for the people and for Aharon, etc. Every single example of prayer in the Torah is positively answered. And every single one was praying for someone else, not for oneself!
I think there is a very important lesson to be learned here – that G-d answers prayers affirmatively, but also that He is clearly much more receptive to prayers that involve caring for others instead of just for ourselves!
In the Torah, the prayers that are answered are those we pray for others.