You are asking the correct questions.

I assume this is awarded to the lowest bid.

Almost all RFPs from the gov't for the second half of FY17 were sent out as LPTA (Lowest Price Techincally Acceptable) instead of Best Value. There was also a shift to order more commercially available items (read: each contract doesn't need to reinvent the wheel), and also a shift to Multiple Award Contracts (MAC). A MAC creates a pool of pre-selected contractors that are eligible to be compete for and be awarded Task Orders under the MAC.

Do we know what the bid amounts were for the other companies?

Typically the competing companies are informed on the results of the evaluation of their proposal whether they were awarded the contract or they weren't in the form of a debrief. The debrief will detail the contributing factors to the gov'ts committee's evaluation of your proposal. Areas that are typically evaluated: Contractor identified strengths and weaknesses, Overall proposal, Technical Plan, Management Plan, Staffing Plan, Past Performance History, Pricing, and possibly other areas.

I'm not involved with BD at the highest level, but the companies do become aware of what the company being awarded the contract bid their proposal at. For example, we had great performance on a contract that was up for rebid, but lost it because a new company came in and undercut us by $2,000.00 on a $250k+ contract. The contract was being awarded based on Lowest Price Technically Acceptable rather than Best Value.

Do we even know what other companies put in a bid?

Yes - trying to get a more clear answer for you on that.