  We present magnetotransport measurements at classical magnetic fields for
three graphene monolayers with various levels of disorder. A square root
magnetoresistance (SRMR) behavior is observed in one sample which has the
characteristic sub-linear conductivity signaling on the presence of short-range
disorder in this sample. No square root MR was observed in other samples where
short-range scattering is inessential as it is evident from the gate voltage
dependences of their conductivities. Comparing our experimental data for the
sample with theoretical calculations we found a good qualitative agreement and
established the conditions which should be fulfilled in graphene to observe the
SRMR experimentally.
