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number1
' 1 ' is. Any power of the number 1 ... including the zero power ... is ' 1 '.
The number 1 is not a prime number. A prime number has exactly two factors, 1 and the number itself. 1 is the only number having exactly one factor.
7 is the closest whole number to 7.03.
3.5 is itself a number and so it is the closest number. You cannot get closer to a number than the number itself!