We present the results of an elliptic flow, v 2 , analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at √ s NN = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v 2 (p T ), is reported for different collision centralities for charged hadrons h ± and strangeness-ontaining hadrons K 0 S , , , and φ in the midrapidity region |η| < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, |η| < 1.0, with those at forward rapidity, 2.5 < |η| < 4.0. We also present azimuthal correlations in p + p collisions at (2010) energy, m T − m, and (ii) at intermediate p T , 2 < p T < 4 GeV/c, it scales with the number of constituent quarks, n q . We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v 2 (p T ) for K 0 S and . Eccentricity scaled v 2 values, v 2 /ε, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v 2 /ε depends on the system size, that is, the number of participants N part . This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.