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The square of any prime number has only three factors. Example: 121 is the square of 11, a prime number. The only factors of 121 are 1, 11, and 121 itself.
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121 is a composite number, having the three factors 1, 11, and 121. A prime number has only two factors, 1 and itself.
121 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
2 is the least prime number.