No, the plural of problem is problems.
problem - problem(s), problem(atic), problem(atical), problem(atically)
Mondai もんだい 問題
rob or robe prope me bore pore be mole Rome poem prom pole elm lore ore lob pro bop more orb mop mope role lobe (part of the ear) perm
add, and, sum, tack on, plus