@Galaga, welcome to the forum.
You can use a 4K monitor with the DisplayPort. The resolution with it is 4096 x 2160. The other two ports on the GTX 745 are a DVI (dual-link) resolution: 2560 x 1600 x 32bpp at 60Hz and a HDMI resolution: 1920 x 1080. Either can be used for a second monitor, but they won't be 4K.
Here is the Product Specifications page for the computer. See the section titled "Video Graphics" for the above information. Also, here is a guide to help you connect the monitors.
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HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
Custom build: Corsair 750D Airflow (Full Tower); MSI MEG z390 ACE; i9-9900K processor (OC'd 5.025); Corsair H150i cooler; 32 GB Corsair Vengeance Pro 3200 memory; MSI RTX 2080 Gaming X Trio video card; Samsung 970 Pro 512 GB; Samsung 860 EVO 1 TB
HP Spectre 360 Convertible; i7-7560U; 16 GB memory; Intel® Iris™ Plus Graphics 640; 512 GB PCIe® NVMe™ M.2 SSD; 13.3" diagonal 4K UHD UWVA eDP BrightView WLED-backlit multitouch-enabled edge-to-edge glass (3840 x 2160); Windows 10 Pro 64 with Windows Ink
HP Photosmart 7520 AIO
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