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You asked:

is the river nile the longest river in the world

Yes. the Nile is the most long river that is in the world.
river

river (a large natural flowing waterway)

the world
the world
the world

the world (the geographical area corresponding to the entire surface area of planet earth)

the Nile

The Nile, the major north-flowing river in North Africa, generally regarded as the longest river in the world