All matter has mass and volume.
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Yes, two is a singular noun because it's a number two. All numbers no matter how many digits are singular nouns. Two million is a number.
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You need at least two things to find something in common between them.
They both show a part of a number
The "C" in "GCF" stands for the word "common", meaning "same for all". There is nothing common about a single item. "4x to the second power" is only one number. If you're looking for common factors, then you need at least two numbers.