
theorem
  5407 is prime
proof
  now
    5407 = 2*2703 + 1; hence not 2 divides 5407 by NAT_4:9;
    5407 = 3*1802 + 1; hence not 3 divides 5407 by NAT_4:9;
    5407 = 5*1081 + 2; hence not 5 divides 5407 by NAT_4:9;
    5407 = 7*772 + 3; hence not 7 divides 5407 by NAT_4:9;
    5407 = 11*491 + 6; hence not 11 divides 5407 by NAT_4:9;
    5407 = 13*415 + 12; hence not 13 divides 5407 by NAT_4:9;
    5407 = 17*318 + 1; hence not 17 divides 5407 by NAT_4:9;
    5407 = 19*284 + 11; hence not 19 divides 5407 by NAT_4:9;
    5407 = 23*235 + 2; hence not 23 divides 5407 by NAT_4:9;
    5407 = 29*186 + 13; hence not 29 divides 5407 by NAT_4:9;
    5407 = 31*174 + 13; hence not 31 divides 5407 by NAT_4:9;
    5407 = 37*146 + 5; hence not 37 divides 5407 by NAT_4:9;
    5407 = 41*131 + 36; hence not 41 divides 5407 by NAT_4:9;
    5407 = 43*125 + 32; hence not 43 divides 5407 by NAT_4:9;
    5407 = 47*115 + 2; hence not 47 divides 5407 by NAT_4:9;
    5407 = 53*102 + 1; hence not 53 divides 5407 by NAT_4:9;
    5407 = 59*91 + 38; hence not 59 divides 5407 by NAT_4:9;
    5407 = 61*88 + 39; hence not 61 divides 5407 by NAT_4:9;
    5407 = 67*80 + 47; hence not 67 divides 5407 by NAT_4:9;
    5407 = 71*76 + 11; hence not 71 divides 5407 by NAT_4:9;
    5407 = 73*74 + 5; hence not 73 divides 5407 by NAT_4:9;
  end;
  then for n being Element of NAT st 1 < n & n*n <= 5407 & n is prime
  holds not n divides 5407 by XPRIMET1:42;
  hence thesis by NAT_4:14;
end;
