Assuming your cursor is in Cell A1:
Use Data Validation.
From the top menu, select...
Data > Validation > Settings > Allow
Select Custom
For 'Formula', put...
=ISNUMBER(A1) = TRUE
Go to the Main Menu: Data: Validation. From there, you can set the
parameters on what can be entered into the cell as well as input and error
messages.
Select Data/Data Validation and select either whole number or decimal
from the list to restrict the cell to that type of content. You get to
set a min and max and can set up an input message (that appears when
the cell is selected - like a comment that responds to selection not
mouse position) and an error message.
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