Julia auto-loaded modules

General Usage
1

If I launch a clean Julia session, I get:

julia> keys(Base.loaded_modules)
KeySet for a Dict{Base.PkgId, Module} with 12 entries. Keys:
  Base.PkgId(Base.UUID("4536629a-c528-5b80-bd46-f80d51c5b363"), "OpenBLAS_jll")
  Base.PkgId(Base.UUID("8f399da3-3557-5675-b5ff-fb832c97cbdb"), "Libdl")
  Base.PkgId(Base.UUID("ea8e919c-243c-51af-8825-aaa63cd721ce"), "SHA")
  Base.PkgId(Base.UUID("7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"), "FileWatching")
  Base.PkgId(Base.UUID("56f22d72-fd6d-98f1-02f0-08ddc0907c33"), "Artifacts")
  Base.PkgId(Base.UUID("8e850b90-86db-534c-a0d3-1478176c7d93"), "libblastrampoline_jll")
  Base.PkgId(nothing, "Main")
  Base.PkgId(nothing, "Core")
  Base.PkgId(Base.UUID("37e2e46d-f89d-539d-b4ee-838fcccc9c8e"), "LinearAlgebra")
  Base.PkgId(nothing, "Base")
  Base.PkgId(Base.UUID("9a3f8284-a2c9-5f02-9a11-845980a1fd5c"), "Random")
  Base.PkgId(Base.UUID("6462fe0b-24de-5631-8697-dd941f90decc"), "Sockets")

Why and how are so many packages automatically loaded, even though they are not shown in Pkg.status()?

Can I suppress the loading of any of these packages?