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The square root is between 8 and 9 so some of the prime factors must be less than 9.

75 is an odd number so 2 can't be a factor, 3? yes, 3 x 25. Aha, 25 = 5 x 5 so prime factorisation is 3 x 5 x 5. Composite factors can easily be worked out as there are only two different prime factors...

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15y ago

What else can I help you with?