Aparentemente isso não é suportado no IrfanView - existem algumas ferramentas autônomas que permitem isso:
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Paint, o bastante:
How to Easily Print a Large Image to Multiple Pages in Windows | Scottie’s Tech.Info
- Open the image you’d like to print in Paint
- Select: Print -> Page Setup (Vista and 7), or File -> Page Setup (in XP)
- Under Scaling, select Fit to and change the setting to something like “2 by 2 page(s)”
- Click OK
- Print the image from Paint, and make sure to select “All Pages”