A number of the form p^a·A is said to be an antisquare if it fails to be a square number for the two reasons that a is odd and A is a nonsquare (modulo p). The first few antisquare numbers are 6, 10, 15, 21, 22, 24, 26, 33, 35, 38, ... (OEIS A080255).

squarefree | squareful | square number