Example:

?- threads.
% Thread Status       Time    Stack use    allocated
% --------------------------------------------------
%   main running     0.544      218,264      317,248
%     gc running     0.006        1,200       87,872
%    pce running     0.116       61,792      186,176
true.

Definitely fewer threads than in a JVM. The pce thread is seen if you have XPCE window that is active.

"Time" is probably cumulative time used 🤔