The Prophet is not dead , he simply went through a transition of this dimension, into another, Aakhira, or Barzaakh
“My life is good for you. You will relate about me and it will be related to you, and my death is a good for you, for your actions will be presented to me. If I see goodness I will praise Allah, and if I see other than that I will ask forgiveness of Him for you.”
Everyone goes into barzakh. Doesn't make em any less dead.
Have you read the Hadith i just posted? if you doubt its trustworthy-ness here are its chain of narrators, This hadith has been narrated from Ibn Mas’ud by Al-Bazzar in his Musnad(1:397) with a chain declared sound by Imam Al-Suyuti in Manahil Al-Safa (pg.31, #8), Ibn Hajar Al-Haytami in Majma’ Al-Zawa’id (9:24 #91), Al-Iraqi in Tarh al-Tathrib (3:297), Al-Munawi in Fayd Al-Qadir (3:401), Al-Khafaji and Al-Qari in Sharh Al-Shifa’ (1:102) and others.
When you say like any time "Sallalhu calayhi wasalam" an angel tells the prophet of your name and your fathers name, and telling that you have sent blessings and prayers upon him, he will then praise Allah, this is proof that the prophet is alive inside his grave, the status of a prophet is different to a human, u must rememebr that.
Reported by ‘Ammar ibn Yassir r.a. that the Prophet s.a.w. said:
“Verily, Allah has put an angel in charge of my grave and given him the names of all creatures. No one invokes blessings upon me until the Day of Resurrection except he informs me of his name and the of his father thus: So and so son of so and so has just invoked blessings upon you.”
Abu Huraira r.a. reported that the Prophet s.a.w. said : “By the one in Whose hand is Abu al-Qasim’s soul, ‘Isa ibn Maryam shall descend as a just and wise ruler. He shall destroy the cross, slay the swine, eradicate discord and grudges, and money shall be offered to him but he will not accept it. Then he shall stand at my grave side and say:
“O Muhammad!” and I will answer him.”
This hadith is narrated by Abu Ya’la in his Musnad (11:462) with a sahih chain as declared by Ibn Hajar Al-Haytami in Majma’ Zawa’id (8:211)