If they are all on one ticket it makes absolutely no difference if there are different airlines involved.

You can check to see if you were issued a single ticket number or not, in the documentation you receive after booking. Note the difference between the ticket number and the PNR (or reservation number). The ticket number will be 13 digits and the PNR is a 6 character alpha/number. With two airlines you would expect to have two PNRs but that doesn't mean you have two tickets.

While it's possible your travel was issued as more than one ticket, I'd be surprised if that were the case with the construction you cite in the OP. But check your ticket info to be certain.

As noted above your question is not novel, and is asked at least once weekly it seems. Search in this forum and also the Travel Buzz forum if you'd like to read up more on hidden city ticketing Q&As.