IS 4K EDITING POSSIBLE WITH THIS iNTEL BUILD?

The editing experience will be rather frustrating with that build due to the following reasons:

1. 16 GB total or RAM is not enough for 4k - that little amount of system RAM is only suitable for 1080p work. Get at least 32 GB of RAM.
2. There appears to be absolutely no discrete GPU at all. Although Adobe treats that integrated Intel UHD Graphics as having over 6 GB of VRAM for the purposes of Premiere Pro, it is really, really feeble in performance compared to almost all recent-generation discrete GPUs. In fact, its overall performance would be three to four times slower (as I discovered in my benchmark testing of an older seventh-generation 4-core/8-thread i7) than with a good low-end discrete $150 GPU such as a GeForce GTX 1650 SUPER (which I picked up yesterday on an impulse buy).
3. That i5-9600K has six cores, all right - but no EMT capability, so only six threads total. That, despite its higher all-core clock speed, makes it not all that much more powerful than the most powerful of the old 7th-Generation quad-core i7 CPUs, especially for the price that you'd be paying for it.

In other words, get a better system, as every single one of the 9th-Generation desktop i5 CPUs are overpriced for the performance (video-editing-wise) that you'd be getting from them. As configured above, that build is barely suitable for 1080p work. And with the 10th-Generation Intel CPUs just having been released (which will require a new Intel 400-series chipset-based motherboard, as the new 10th-Generation mainstream desktop CPUs will require a new CPU socket, LGA 1200) and will soon be shipped to resellers, all of the mainstream 9th-Generation Intel CPUs, except for maybe the still-pricey i9 models, are just a waste of money right now.