No. Don't get confused between a mainframe and a server.
companies on need a few not thousands
Computers, Which are technically superior to mainframe are called super computers.
short history of mainframe
Mainframe computers first used star topology
Mainframe computers are high-speed, multi-purpose machines that cost millions.
IBM
IBM system 3 and AS-400 are some examples of minicomputers.
mini and mainframe computers
no
For a mainframe with terminals, data processing takes place on the mainframe computer only as the terminals are 'dumb'. Conversely, in a network of computers, each computer has its own processor.
yes
There are not a large number of mainframe jobs available at this time. Computer programmers will be around as long as there are computers. There are so many different brands of computers available.