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If you mean file size, then the image in your post is only 159kb. A tiny fraction of 4Mb
If you are talking about pixel size, then you need to be specific. It is currently 600px X 460px. What size do you need it to be?
You want a 4 million pixel image from an image with dimensions of 600 x 460 px.
Your image has approx 0.276 MP (600 x 460 = 276,000 px), so it's around 25% of the desired size.
You will need to interpolate/resample to a larger size, say 400% - which may produce poor results. As this is an illustration, you may have more leeway.
If you are wishing to submit the image to a stock photo library, reconsider, they don't want or accept upsampled images.
There are "new" AI based resizing methods (not in Photoshop) which will invent new detail to make the newly resized image more detailed. This may produce a image with "better" detail, however the detail may or may not be faithful, accurate or acceptable, YMMV. Good luck!
EDIT: Attached are examples from two different free web-based AI resizing tools, which are arguably better than Photoshop's various image size interpolation methods. The Photoshop neural filter "Super Zoom" does a better job than image size, which I have also added to compare to the other AI resizes.
It ocurred to me that the only reason a person might have such a tiny image is if they found it online. If it was their own image then there can't be a phone or camera anywhere that does not create 4Mp digital images. So I used a reverse image search and found this. Still well short of 4Mp, but a lot bigger than the one the OP posted.
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