How to identify whether a data is time series data

@mtare wrote:

I am trying to model Sales which present at various levels (like Product-Category, Product etc.). Time is also one of them. Is there any way by which we can identify whether this is a time series data or not.(I read somewhere that Time series process is a stochastic one ??). I need this to decide on which techniques to use (ARIMA,Regression etc.) ?

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