What format? This is important.
If you get random JPG/TIFF etc, just check the pixel dimensions and divide by 2x the expected line screen*. If the result is approximately your anticipated desired printed dimensions, you have proper resolution. So if you are printing a magazine at 150lpi on press, the recommended dpi/ppi is going to be 300. A 3000px image will print optimally at 10 inches (3000px/300ppi).
If you have indesign packages, check the Links tool and look for the "effective dpi/ppi." A 3000px "300ppi" image is only 300ppi at 10 inches. If you place it at 5 inches, it is now 600ppi. At 20 inches it is now 150ppi.
If you have to, make a spreadsheet with column 2 as height of every image as laid out (in inches), and then in column 1, make a list of the pixel height of the images. Calculate the numbers as above (col1_px/col2_inches=col3_effective_dpi).
*("Shannon-Nyquist Sampling Theorem": to accurately reproduce a signal you need to provide data at 1.5-2x the sample rate)