No, it isn't. It can only perform basic mathematical calculations. A computer must be programmable in order to be Turing-complete.
In 1642, Blaise Pascal invented the Pascal's calculator, a mechanical calculator. The laborious arithmetic calculations required by his father's work as the supervisor of taxes in Rouen inspired Pascal to create a calculator.
It must have some kind of programming language in which you can write instructions that can be followed automatically or by a human operator to perform any type of data processing.
Thus, it can be concluded that Pascaline calculator is not actually a computer according to the Turing model.
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