Odd number pair: second = a fixed multiple of n squared

This type of question, asked 2 times: 18 Sep 2024 S2, 18 Sep 2024 S3. All 2 questions below, oldest first.

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Question 1
18 Sep 2024 S2
17 $Three of the following numbers are alike in a certain way and one is different. Pick the odd one out. (NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /deleting /multiplying etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) weerbb$
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Question 2
18 Sep 2024 S3
18 $Three of the following numbers are alike in a certain way and one is different. Pick the odd one out. (NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /deleting /multiplying etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)$
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Question 1