Tax return for kids

My 18 year old made <3000 through combination of a summer job, a scholarship and some dividends. I'm wondering three things.

1. He received a W2 for his summer job. No federal taxes were withheld neither on his W2 nor on his scholarship. Does he need to file an individual return?

2. If he doesn't file an individual return should I show his income and dividends through my tax return. I'm claiming him as my dependent as he is a full time student.