=2002×(2002+1)×(2002+2)×(2002+3)+1
=2002×(2002+3)×(2002+1)×(2002+2)+1
=(2002²+2002×3)(2002²+2002×3+2)+1
=(2002²+2002×3)²+2(2002²+2002×3)+1
=(2002²+2002×3+1)²
=4014011²
这个整数是±4014011
=2002×(2002+1)×(2002+2)×(2002+3)+1
=2002×(2002+3)×(2002+1)×(2002+2)+1
=(2002²+2002×3)(2002²+2002×3+2)+1
=(2002²+2002×3)²+2(2002²+2002×3)+1
=(2002²+2002×3+1)²
=4014011²
这个整数是±4014011