Is the existence of Kandor public knowledge on Earth-1?

[Great Rao]

Given the scale of strength demonstrated by Superman, a microscopic Kryptonian would still be hugely formidable...  heck maybe even moreso in some ways since they'd be so hard to detect.  And then there's those brains filled with advanced technology which become super under our yellow sun.  Let them out for a few minutes and their enhanced brain power plows through possible solutions that would take years otherwise.  They could potentially solve their size problem on their own, without Superman having to be their savior.

Of course, it's not as cool as a bottled city... 

In effect, they would be microscopic super-powered nanites that could do pretty much anything.  Take over computers and computer networks and re-program them on the fly; enter human bodies to rebuild and/or heal them (brain surgery, eye surgery, DNA enhancement) or give them super-powers; inhabit automobiles or other machinery in order to create "flying cars," etc.  The man walking down the street would see a building collapse due to some accident - then somehow re-coalesce and "heal" itself, unaware that the Kandorians were fixing the accident as it happened.  There could be an entire super-powered microscopic civilization inhabiting the planet and seemingly performing miracles.

[TELLE]

Is there any consensus on the population of Kandor? 

I seem to remember it being referred to as "eight million", which seemed to be the standard size of a big city in 1970s DC comics: Metropolis and Gotham City are also said to have eight million inhabitants.

I can't find a reference to population anywhere myself.  I remeber we had a discussion about the population of Krypton as a whole, about which Supermanica says:

Perhaps one explanation for the comparative lack of strife on Krypton lay in the relative sparseness of the population, for despite the vast size of the planet, its population may have numbered only in the millions (S No. 141, Nov 1960: "Superman's Return to Krypton" Pts 1-3).

Although later sources I'm sure say "billions".

Al Schroeder says:

In a Denny O'Neil "Fabulous World of Krypton" featurette, Superman told a story to Green Arrow and Balck Canary about the singing flowers of Krypton and the scientist who tried to awake people from their music-invoked stupor. At the end, he said either nine billion or twelve billion died in the explosion of Krypton....I THINK nine billion.

and dto claims that the population was set at 7 million in 1977:

https://www.supermanthroughtheages.com/smf/index.php?topic=2452.msg19266#msg19266

[Johnny Nevada]

Given the scale of strength demonstrated by Superman, a microscopic Kryptonian would still be hugely formidable...  heck maybe even moreso in some ways since they'd be so hard to detect.

I keep thinking of Atom Ant here for whatever reason ("up and at 'em!")...