  We present a systematic study of electrical resistivity, Hall coefficient,
magneto-optical imaging, magnetization, and STEM analyses of
KCa${_2}$Fe${_4}$As${_4}$F${_2}$ single crystals. Sharp diamagnetic transition
and magneto-optical imaging reveal homogeneity of single crystal and prominent
Bean-like penetrations of vortices. Large anisotropy of electrical resistivity,
with ${\rho _c / \rho _{ab}}$ > 100, and semiconductor-like ${\rho _c}$ suggest
that the electronic state is quasi two-dimensional. Hall effect measurements
indicate that KCa${_2}$Fe${_4}$As${_4}$F${_2}$ is a multiband system with holes
as main carriers. Magnetization measurements reveal significantly larger J$_c$
compared with that in other iron-based superconductors with different values of
J$_c$ depending on the direction of magnetic field. Origin of these J$_c$
characteristics is discussed based on microstructural observations using STEM.
In addition, further enhancement of J$_c$ in KCa${_2}$Fe${_4}$As${_4}$F${_2}$
for future application is demonstrated in terms of heavy-ion irradiation.
