Can i get away from this?

I was dealt KK on Button. Raised 6x BB with 3 limpers and got two callers

Flop: 466 different suits

Limpers check to me and i raise half the pot. One of them pushes all in.

I put him on 44 but call because he's been pretty agressive. He turns over A6

Did i do anything wrong? How could i possibly put him on something like A6 and how can i get away from it?
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Another question
Board was
4K787 with 3 clubs. I hate the ace-x of clubs and the nut flush draw on the turn. I called and the 7 of clubs came up on the river. I pushed all in and he calls and flips over 78

was i suppose to be able to muck that there and/or did i play the hand incorrectly by not folding? or should i just chalk one up for the cooler and realize i got unlucky?

Trust your reads. Stakes would help as well

Hand 1 is a call if your opp is aggressive, theres a wide variety of hands that shove there. Most of 22-QQ you beat. Plus shit with straight draws and 4x hands especially if your villain is aggressive.

Bigger raise pre-flop.
How deep is the money?
I think you trapped yourself here.

Hand 1, impossible to say without reads/stack sizes/whether this is FR or 6-max/stakes. However, if 100BB effective at the start of the hand: Raise at least 2/3 of the pot on the flop, and 7xBB preflop. You can't put him on 44, because A6 plays the same way, so you have to put him on 44/A6, and to be honest (this is next to impossible without a read on the guy, but...), a lot of guys at micro (which is where I'm assusming you play) have *approximately* this: J6s/Q6/K6/A6/64/63s/65/76/86/96s/44/66/77/88/99, and some slow played AA once in a blue moon, so your equity is about 30%, and you need to fold. That's very approximate, and changes according to stack size/reads, but basically your over pair isn't great.

Hand 2: again, reads/stacks sizes, other streets, yada yada, but... You need to be careful when the board is paired, but not that careful. All else being equal/generic I don't mind going broke there, sounds like somewhat of a cooler.

If you're playing low stakes, hand number one should probably be folded. Typically at low stakes if you have top pair (or even a great overpair) and are raised after betting 1/2 of the pot, you are beat.

Hand number 2: At low stakes, there's enough players who would go all in with ANY flush to justify your call.