All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.
We did not find any authentic evidence stating who would be the last prophet to enter Paradise. Regarding the reports which say that Sulaymaan ibn Daawood (Solomon son of David) will be the last prophet to enter Paradise because of his mammoth kingdom in this life or that he will enter Paradise forty years after the prophets – all these reports are inauthentic, as Al-Qurtubi said in his Tafseer (Quranic exegesis).
Allaah Knows best.