Wordpress keeps resizing my 947x947 image down to 500x500 (full-size option)

Wordpress keeps resizing my 947x947 image down to 500x500 (full-size option)

This is driving me crazy. The code for the image is: < img src="MYLINK" />
Yet it keeps resizing my image down to 500x500 from 947x947. How do I fix this?
Also, it disregards the image map I have which lets you click on different parts of the image to go to different sites.