If I scale photo in Ai, does ppi changes too?

I have some photos (14 photos) and I need to add it to one composition and print it. Photos are 72 ppi, I can make it 300 ppi in Photoshop but I don't know if it's necessary? If I scale it down does the ppi of the photo increases?

Mumblefluff,
For Illy, the photos are just a black box of pixels, so when you change the size, the number of pixels is the same so the resolution changes in inverse proportion.
Photos are 72 ppi
You may see it this way: each photo is a specific number of pixels (by pixels), and you can stretch it or compress it as you like without that number changing, so size and resolution are inversely proportional.

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