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If the square root of the number doesn't come in decimal is known as perfect square number.

For example,

16= 2×2×2×2 = 2²×2² = two pairs of factor 2

0.25 = 0.5×0.5 = one pair of factor 0.5

441 = 3×3×7×7 = one pair of factor 3 and one pair of 7

84= 2×2×3×7 = one pair of factor 2 but factor 3 and 7 are not in pair, so 84 is not perfect square.

and so on.