How large I can print photos taken by an iPhone?

Recently I have started a photographic project using an iPhone 5s, which has a 8mp camera and I'm shooting this project on phone's built in square format. I'm kinda concerned whether I can print these photos in large size for any exhibition or photobook. I've checked the exif of those photos, it shows these photos have 2448*2448 pixels on 72dpi. Is this enough for large print? Can I have life size prints of these photos?

The PPI necessary for making prints is 300. That 72 ppi is the default setting for images viewed on a computer monitor, tablet or mobiole

You can do a test and have a 4 x 6 inch print made of one of them and see how it goes

NO.

Those dimensions at a printable resolution of 300 ppi is equal to a print size of about 8 x 8 inches. To even print at 16 x 16 inches brings the resolution down to the 150 range. To print "life size" would result in pretty much a blurry, pixelated mess.

You could probably get away with printing at 10 x 10 inches IF the photo is properly exposed and has excellent focus. Any resampling to go to larger sizes or post processing to adjust exposure is going to degrade an already marginal file size.

Sorry, you can't get blood out of a turnip. You need a proper camera for your intentions.

As others noted, 8x8" printed at 300dpi (preferred) or 16x16" if printed at 150 dpi (ok if viewed at a distance).
If you want it printed any larger, you'll need to do a test print and see if it's good enough for what you need.
You'll also have another issue which is the quality of the phone image. If you have good lighting, it will work, but anything less than good lighting and the limitations of a cell phone camera will show up in the printed image quality.

Smart phones are at their best when viewed on, well, a smart phone. An 8mp image on a larger sensor is probably good up to 11x14 inches. I had a 20D SLR that had 8mp prints blown up to 3x5 feet and on display in the Long Island Aquarium. They were soft when viewed up close. When viewed from a distance they looked fine. But they were journalistic shots, not fine art. The limitation that you're dealing with in a smart phone is that the optics are teeny tiny and the sensor is as small as you can get. That's not a good recipe for printing large.

IPhone 5s,
https://support.apple.com/...cale=en_US

iSight megapixels with pixels
"3264 x 2448 px (10.8 x 8.1)

FaceTime photos (1280 by 960)
_____________

"2448x 2448 pixels" @72 ppi /dpi =34 inches

"2448x 2448 pixels" @300 ppi /dpi =8.1inches
"2448x 2448 pixels" @144 ppi /dpi =17 inches

life size is variable, shrink to the life size of ant, enlarge to life size of a whale,

even if portrait of person face alone may require four time sizing, without sharper resolution quality,

if full size of humans you then would have to take separate photos of every square foot and make composite panoramic view, and offsets would distort image.

So alone not really, with plugin tools maybe larger, and clear image and focused better.

And don't forget about megabytes for files sizes.

Given those number of pixels and the DPI, that image will have a size of 34x34".

Printers however print at a minimum of 300 DPI so if you convert your image to that, it will just become an 8x8" print.