Why prophet Ibrahim a.s mentioned many time in Quran

I just couldn't wrap it in my head when we have to send salaam (salawat) to prophet Ibrahim (and what is the real intention of doing that?). And in Al-Quran there are so many time mention about him. > And [mention] when Abraham was raising the foundations of the House and [with him] Ishmael, [saying], "Our Lord, accept [this] from us. Indeed You are the Hearing, the Knowing. **Al-Baqarah:127** --- > And Abraham instructed his sons [to do the same] and [so did] Jacob, > [saying], "O my sons, indeed Allah has chosen for you this religion, > so do not die except while you are Muslims." **Al-Baqarah:132** --- > Have you not considered the one who argued with Abraham about his Lord [merely] because Allah had given him kingship? When Abraham said, "My Lord is the one who gives life and causes death," he said, "I give life and cause death." Abraham said, "Indeed, Allah brings up the sun from the east, so bring it up from the west." So the disbeliever was overwhelmed [by astonishment], and Allah does not guide the wrongdoing people. **Al-Baqarah:258** There are just too many about him in this holy book. I know him as *Khalilullah* but what is so special about him? Because Allah already declared Islam is the favourable deen which is jihaded by our Prophet, Muhammad SAW.