No, that is not what happened at all.
In special weapons, one of the hardest things to do is to keep all the pieces together so all the fissionable elements to so, and not just lose shape and start to be blown apart in the first few picoseconds... and as a result you lose the vast majority of your fissionable materiel.
It’s not that much of a problem with very crude devices, such as the pie and wedge Little Boy, but when you try to make the warhead smaller, and current weapon-sized, it was beyond the NORKs capability in their first test.
It was a nuclear (splitting atoms chain reaction) explosion, but a very weak “sloppy” one.
>>No, that is not what happened at all.
Damn, I’m glad we have a freeper in North Korea who knows all this stuff.