After install, cmd says 'cmake' is not yet installed and can be installed with apt-get

I might be doing some confusion, but after:
sudo ./bootstrap --prefix=/usr/bin && sudo make && sudo make install
inside of cmake-3.16.8 folder, when I type ‘cmake’ in cmd, why do I get:
The program ‘cmake’ is currently not installed. You can install it by typing:
sudo apt install cmake

Note: I’ve checked and the folder ‘/usr/bin’ is listed in PATH.

Any thoughts?
Thanks in advance!

The prefix is where all of CMake goes. You probably have /usr/bin/bin/cmake at that point. You should use --prefix=/usr (though I’d recommend /usr/local to avoid conflicting with any cmake package you install in the future).