That's a trick question.
Intel obviously makes most of the microprocessor chips used in PCs (and Macintoshes). Everybody knows that. But the PCs (and Mac) business isn't actually very big. (It's very profitable, but it's not very many units.) In fact, if you counted all the PCs and Macs in the world they would add up to just 2% (two percent) of all the microprocessor chips used worldwide. So it's fair to say that Intel dominates that 2% segment of the market.
The company is a comparatively small player for the other 98% of microprocessor and microcontroller chips. That market (called "embedded" microprocessors) is much broader and includes dozens of vendors from all over the world. There is no dominant player in that market: not Intel, not AMD or ARM or Fujitsu or Sony or any other company. It's quite fragmented.