  We have investigated the magnetic and transport properties of a
polycrystalline Pr2Pt3Si5 sample through the dc and ac magnetic
susceptibilities, electrical resistivity, and specific heat measurements. The
Rietveld refinement of the powder X-ray diffraction data reveals that Pr2Pt3Si5
crystallizes in the U2Co3Si5-type orthorhombic structure (space group Ibam).
Both the dc and ac magnetic susceptibility data measured at low fields exhibit
sharp anomaly near 15 K. In contrast, the specific heat data exhibit only a
broad anomaly implying no long range magnetic order down to 2 K. The broad
Schottky-type anomaly in low temperature specific heat data is interpreted in
terms of crystal electric field (CEF) effect, and a CEF-split singlet ground
state is inferred. The absence of the long range order is attributed to the
presence of nonmagnetic singlet ground state of the Pr3+ ion. The electrical
resistivity data exhibit metallic behavior and are well described by the
Bloch-Gr\"uniesen-Mott relation.
