Would you feel comfortable at 3200? Or maybe at 1600?
It is not noise that matters but its visibility. Each ISO has inherent noise, greater than the one before it. However, the smaller the noise, the less visible it is. So, the acceptable ISO depends on the viewing or printing size.
For a moderately large print, I would stick to ISO 800 or less on the T5. For a mid-size one, say a 12" x 8", possibly use ISO 1600 but no more. And if I had to make a small print, then ISO 3200 or 6400 would be acceptable.
Each time I review a camera, I show a sample crop from an image taken at each ISO. Here is the Canon T5 Review and this page shows a crop from an image taken at each ISO with it. From there, if you go to the Images page, you can see images taken at each ISO. Underneath you can click on the 4x6 or 8x12 label to see a scaled down version of the image image. If you do that with some of the high ISO images, you will clearly see that how noise is perceived is quite different once an image is scalled down.
The ISO boost decreases noise on Canon cameras. The noise is because exposure is low (due to low light, for example, and inability to open the lens wider and/or use slower shutter speed, or lack of experience) which means the signal is low and drowning in noise.