Is the wheat affected by bugs edible? Should we eat this flour after getting these bugs out from flour? Does it affect hygiene factor of the flour?

I know the type of bug you mean, and no you can't eat the flour after it has been contaminated. They will have left their eggs in the flour to feed and mature. You would not be able to see the larvae. You will have to throw out bread and such, and clean your cupboards thoroughly.

No - Toss It.

Those are 'pantry moths' or 'Indian meal moths' probably. A very small moth?
They are almost impossible to get rid of. And if you don't throw everything out, they will multiply like crazy. Keep new flours, cereals, pet foods, rice, beans, bread crumbs, etc in the fridge, freezer, or containers with very good seals - NOT soft plastic or ziplock bags. The moth can lay it's eggs through plastic.
OXO is the best container, although expensive. You also have to wash out all your cabinets. It can take weeks of work.
I got them once in bird seed. Sometimes they are more common in organic products.

I had a weevil problem a while ago. I cleaned everything out and they went away for a while but they came back in a few weeks. I searched the web for solutions on how to get rid of them and came across a product called Weevil Away. They have these little adhesive sticky pads that have a natural/organic solution on them. They repel the weevils which sounded like a great idea to me. I'd rather repel them in the first place rather than wait for them to show up and then try to get rid of them. I stuck one in every one of my cupboards and hoped for the best. The smell is fantastic and it's been almost a year and still no weevils. Love this stuff!

That is the reason I do not use wheat flour. I figure if you buy the bag and no bugs, then you go to use it again and bugs. The bugs had to of been eggs in the wheat before they hatched.