The present article significantly investigated projectile's lightest fragments (proton) multiplicity distribution and probability distribution with 84 Kr36 emulsion collision at around 1 A GeV. The multiplicity and normalized multiplicity of projectile's lightest fragments (proton) is correlated with the compound particles, shower particles, black particles, grey particles, helium fragments particles and heavily ionizing charged particles. It is found that projectile's lightest fragments (proton) are strongly correlated with compound particles and shower particles rather than other particles and the average multiplicity of projectile's lightest fragments (proton) increases with increasing compound, shower and heavy ionizing particles. Normalized projectile's lightest fragments (proton) are strongly correlated with compound particles, shower particles and heavy ionizing charge particles. The multiplicity distribution of the projectile's lightest fragments (proton) emitted in the 84 Kr36 + emulsion interaction at around 1 A GeV with different target has well explained by KNO scaling.The mean multiplicity of projectile's lightest fragments (proton) depends on the mass number of the projectile and does not significantly dependent of the projectile energy. The mean multiplicity projectile's lightest fragment (proton) increases with increasing the target mass number.