effective ppi of 2059 x 600
That would indicate a size not ppi.
The general rule of thumb when using raster images in InDesign for print production is to ensure all image are at least 240ppi and are never enlarged in InDesign. More than 240PPI is never an issue.
240ppi is the bare minimum for commercial printing. 300ppi is commonly used because it's a nice round number and offers support for slightly denser line screens. It is best to use 300ppi as a minimum if you can. 240ppi is only if you must.
Most digital cameras will capture data at 240ppi. This can be acceptable with a line screen (LPI) of 150. 150LPI requires 225ppi as a minimum and is a very common line screen for most offset printing. However, 175LPI will require 265PPI for quality reproduction.
Minimum PPI = 1.5 * LPI. Often you won't know the LPI. Therefore, using 300PPI as your minimum often allows the same image to be reproduced at a decent quality even if the line screen being used is higher quality.
In short.. aim for a minimum 300ppi and don't enlarge images within InDesign.
The "effective PPI" can be largely ignored in many instances. If your images meet the above statement, then any output should be sufficient for print production.
Effective PPI can be helpful if you are reducing raster images within InDesign. If you have a 72ppi raster image and reduce it to 25%, then the effective PPI becomes 288ppi - making it suitable at that 25% size for commercial printing.
If you reduce a 300ppi image within InDesign to the same 25%, the effective PPI will jump to around 1200ppi. But that's not really a problem. There's rarely such a thing as "too much PPI".
Raster images should really never be enlarged within InDesign. If you do enlarge a raster image, you can keep an eye on the Effective PPI to assist in finding the "break point" of an enlargement - that point where the effective ppi drops below 240. As the raster image size increases the effective ppi will decrease.
For example, you can enlarge a 300ppi raster image within InDesign to 120% it's original size. The effective PPI will drop to around 250. This is still suitable for commercial printing. However, I'd stress that it's really always best to enlarge raster images with Photoshop if they need enlargement. Photoshop will do a much better job at interpolating pixels than InDesign will.
If all your raster images are...
- 240ppi or better
- placed into InDesign
- not scaled (up or down) within InDesign
then all the images are fine.