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The least square number which is exactly divisible by 3, 4, 5, 6 and 8 is
The LCM of the numbers is $$120 = 2^3 \times 3 \times 5$$. To make it a perfect square, each prime needs an even power, so we multiply by $$2 \times 3 \times 5 = 30$$. The required number is $$120 \times 30 = 3600 = 60^2$$.
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