How to get the IC numbers of the logisim items
The standard components of Logisim are not modelled after specific ICs. So there are no IC numbers.

It is rather the other way around: You can (to some degree) model a certain IC with a component in Logisim. You might like to search for a Logisim library which contains models of ICs.

There are far too many technologies like TTL, CMOS, FPGA, CPLD, and so on. How should a learning tool like Logisim support them all? It is more about learning digital logic on an abstract level.