Riddle: I can be long or short, yet never change in size. I…

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i-am-a-number-small-and-neat-multiplied-with-myself-i

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i-am-the-sum-of-digits-that-always-gives-you-away-yet-i

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i-start-with-a-line-that-never-ends-yet-no-height-can-i

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i-have-a-face-like-a-clock-but-numbers-i-lack-i-divide

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i-can-measure-weight-but-lack-a-scale-count-time