14 (I think).
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4 and 9
890
The square of any prime number has exactly three factors: 22, 32, 52, etc.
They're called the "factors" of the given number.
Exactly the same way you do when they're all whole numbers, or there are more than three numbers, or they're a mixture of whole numbers and decimals: -- Add up all the numbers on the list. -- Divide the big sum by the number of items on the list.