Good day, I am interested in finding out how to reduce 2.5 Mb images even ten at a a time to about 500kb, is there a way?

Its resolution will be higher. Reduce its resolution and size will be reduced automatically.
You can use gimp or kolour paint to reduce the resolution & size.

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If you have multiple images you can use command in imagemagick: that would be something like:

It's a little bit hidden in the above example (if you are a newbie to commandline stuff), but the operative command you should investigate is "convert". Specifically "convert" with the "-resize" option. All that other "find" and "ionice" stuff is great if you understand what they are doing, but they have nothing to do with image resizing.

Generally people take images using 5 mega px, 10 mega px or higher mega pixel camera because of this image size is more than 2 MB.
Now when you see the dimension of the image, the width & height is more than 2000 pixels. If you reduce this dimension and make it in the range of 800, the image size is reduced as well as the image does not look stretched or pixelated for normal view (without zoom).

Ex-
if an image has 3457 x 2408(w x h)dimension and 2.2 MB image size, if you make it into 800 x 557 (a normal sufficient view to see an image without zoom), it's size becomes around 500kb.
These are not standard numbers.
This is a just an example.

Thanks, I reduced one in GIMP. Scaling it down. In the future good to learn how to do ten at a time.

I always set my point-n-shoots to lower than max resolution. I have a nice little Canon Elph that is 12.1 megapixels. Although it's a nice camera, it is nowhere near the quality required to make use of 12 megapixels. The lens isn't outstanding nor is it useful to put 12 megapixels onto a itty bitty sensor like these point-n-shoots have. High pixel counts are just marketing foolishness to make you think the cameras are better than they really are. Much more important is the size and quality of the sensor, not how many pixels they managed to cram onto the thing.

Reduce the image size before the camera takes the picture in the first place, and then you don't have to mess with ridiculously large photos on your computer. Of course, if you have a professional level camera that CAN make use of high pixel counts, the above advice doesn't apply.