
theorem
  6571 is prime
proof
  now
    6571 = 2*3285 + 1; hence not 2 divides 6571 by NAT_4:9;
    6571 = 3*2190 + 1; hence not 3 divides 6571 by NAT_4:9;
    6571 = 5*1314 + 1; hence not 5 divides 6571 by NAT_4:9;
    6571 = 7*938 + 5; hence not 7 divides 6571 by NAT_4:9;
    6571 = 11*597 + 4; hence not 11 divides 6571 by NAT_4:9;
    6571 = 13*505 + 6; hence not 13 divides 6571 by NAT_4:9;
    6571 = 17*386 + 9; hence not 17 divides 6571 by NAT_4:9;
    6571 = 19*345 + 16; hence not 19 divides 6571 by NAT_4:9;
    6571 = 23*285 + 16; hence not 23 divides 6571 by NAT_4:9;
    6571 = 29*226 + 17; hence not 29 divides 6571 by NAT_4:9;
    6571 = 31*211 + 30; hence not 31 divides 6571 by NAT_4:9;
    6571 = 37*177 + 22; hence not 37 divides 6571 by NAT_4:9;
    6571 = 41*160 + 11; hence not 41 divides 6571 by NAT_4:9;
    6571 = 43*152 + 35; hence not 43 divides 6571 by NAT_4:9;
    6571 = 47*139 + 38; hence not 47 divides 6571 by NAT_4:9;
    6571 = 53*123 + 52; hence not 53 divides 6571 by NAT_4:9;
    6571 = 59*111 + 22; hence not 59 divides 6571 by NAT_4:9;
    6571 = 61*107 + 44; hence not 61 divides 6571 by NAT_4:9;
    6571 = 67*98 + 5; hence not 67 divides 6571 by NAT_4:9;
    6571 = 71*92 + 39; hence not 71 divides 6571 by NAT_4:9;
    6571 = 73*90 + 1; hence not 73 divides 6571 by NAT_4:9;
    6571 = 79*83 + 14; hence not 79 divides 6571 by NAT_4:9;
  end;
  then for n being Element of NAT st 1 < n & n*n <= 6571 & n is prime
  holds not n divides 6571 by XPRIMET1:44;
  hence thesis by NAT_4:14;
end;
