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Omni-MATH / How many of the 20 perfect squares 1²,2²,3²,…,19²,20² are divisible by 9?

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problem

How many of the 20 perfect squares 12,22,32,…,192,2021^{2}, 2^{2}, 3^{2}, \ldots, 19^{2}, 20^{2} are divisible by 9?
Plain-text mathematical notation (without MathML)
How many of the 20 perfect squares 1²,2²,3²,…,19²,20² are divisible by 9?
Original LaTeX notation
How many of the 20 perfect squares $1^{2}, 2^{2}, 3^{2}, \ldots, 19^{2}, 20^{2}$ are divisible by 9?

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