CREATE TABLE table_15798 ("Character" TEXT, "Portrayed by" TEXT, "Main cast seasons" TEXT, "Recurring cast seasons" TEXT, "# of episodes" FLOAT)

How many episodes were portrayed by Nick Jonas?
SELECT COUNT("# of episodes") FROM table_15798 WHERE "Portrayed by" = 'nick jonas'
SELECT COUNT("# of episodes") FROM "table_15798" WHERE "Portrayed by" = 'nick jonas'