Problem #PRU-100294

Problems Methods Proof by contradiction

Problem

Denote by ab=10a+b the two-digit number whose first and second digits are a and b respectively. Do there exist two 2-digit numbers ab and cd such that ab×cd=abcd? (Here abcd is a four-digit number with digits a, b, c and d, i.e. abcd=1000a+100b+10c+d.)