No, not every number has an even number of factors. Most numbers do, but perfect square numbers have an odd number of factors because one factor (like 6 in 36) is repeated and does not pair with a different number. Class ...
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Yes, 324 is a perfect square. Its prime factorisation is 2 × 2 × 3 × 3 × 3 × 3. These can be grouped into two equal groups. So, 324 = 18 × 18 and its square root is ...