Is CH3COOH a strong base

NO!!!!

CH3COOH is the formula for the carboxylic acid Ethanoic (Acetic) Acid.

Ethanoic acid is a weak acid. it has a pH of about 3 or 4.

The IUPAC organisation have drawn up standards for organic formulae.

For Carboxylic( Weak / Fatty) acids always have the formula R-COOH .

The 'R' being the rest of the molecule.

Structurally, the 'C' has four bonds. A single bond to the 'R'. A double bond to one oxygen, and a single bond to the other oxygen , which in turn has a single bond to the hydrogen . In 2-dimension it is displayed as

R-C(=O)-O-H.

The 'H' dissociates to form 'H^(+)' the acid ion. It does not dissociate as 'O-H^(-). the hydroxide ion.