
theorem
  7457 is prime
proof
  now
    7457 = 2*3728 + 1; hence not 2 divides 7457 by NAT_4:9;
    7457 = 3*2485 + 2; hence not 3 divides 7457 by NAT_4:9;
    7457 = 5*1491 + 2; hence not 5 divides 7457 by NAT_4:9;
    7457 = 7*1065 + 2; hence not 7 divides 7457 by NAT_4:9;
    7457 = 11*677 + 10; hence not 11 divides 7457 by NAT_4:9;
    7457 = 13*573 + 8; hence not 13 divides 7457 by NAT_4:9;
    7457 = 17*438 + 11; hence not 17 divides 7457 by NAT_4:9;
    7457 = 19*392 + 9; hence not 19 divides 7457 by NAT_4:9;
    7457 = 23*324 + 5; hence not 23 divides 7457 by NAT_4:9;
    7457 = 29*257 + 4; hence not 29 divides 7457 by NAT_4:9;
    7457 = 31*240 + 17; hence not 31 divides 7457 by NAT_4:9;
    7457 = 37*201 + 20; hence not 37 divides 7457 by NAT_4:9;
    7457 = 41*181 + 36; hence not 41 divides 7457 by NAT_4:9;
    7457 = 43*173 + 18; hence not 43 divides 7457 by NAT_4:9;
    7457 = 47*158 + 31; hence not 47 divides 7457 by NAT_4:9;
    7457 = 53*140 + 37; hence not 53 divides 7457 by NAT_4:9;
    7457 = 59*126 + 23; hence not 59 divides 7457 by NAT_4:9;
    7457 = 61*122 + 15; hence not 61 divides 7457 by NAT_4:9;
    7457 = 67*111 + 20; hence not 67 divides 7457 by NAT_4:9;
    7457 = 71*105 + 2; hence not 71 divides 7457 by NAT_4:9;
    7457 = 73*102 + 11; hence not 73 divides 7457 by NAT_4:9;
    7457 = 79*94 + 31; hence not 79 divides 7457 by NAT_4:9;
    7457 = 83*89 + 70; hence not 83 divides 7457 by NAT_4:9;
  end;
  then for n being Element of NAT st 1 < n & n*n <= 7457 & n is prime
  holds not n divides 7457 by XPRIMET1:46;
  hence thesis by NAT_4:14;
end;
