Yes. Nearly all MacBook "Pro" laptops support numerous external monitors. Here are the specifications for yours: MacBook Pro (15-inch, 2019) - Technical Specifications - Apple Support. Your model supports the built-in display, plus "Up to two displays with 5120-by-2880 resolution at 60Hz at over a billion colors", or "Up to four displays with 4096-by-2304 resolution at 60Hz at over a billion colors". All four USB-C ports are Thunderbolt 3, supporting "Native DisplayPort output over USB‑C".
Therefore, you simply need the correct monitors and cables. To work, the monitors' USB-C ports must support DisplayPort. You must also use Thunderbolt cables, not just any cable that has USB-C ends on them.
What are the make and model of the external monitors that you are trying to use. Someone should be able to tell you how to make the best use of them.