No, electrons are not made up of quarks. Electrons are elementary particles and belong to a different category of particles called leptons. Quarks and leptons are the two main classes of elementary particles in the standard model of particle physics.
Quarks are the building blocks of hadrons (such as protons and neutrons) and experience the strong nuclear force. There are six known types, or flavors, of quarks: up, down, charm, strange, top, and bottom.
On the other hand, electrons are fundamental particles and do not consist of smaller constituents. They have a negative electric charge and are not affected by the strong nuclear force. Electrons, along with two other electrically charged leptons called muons and taus, are part of the lepton family.
The standard model describes electrons and quarks as distinct and separate elementary particles. They have different properties, interactions, and roles in the structure of matter.