Error lvalue required as left operand of assignement

#include <stdio.h>
#include <stdlib.h>
#include<math.h>

int main()
{

  int entier , A ;
  printf("donner un entier") ;
  scanf("%d", &entier);
   A=(((entier%100)%10)+(entier/100)+((entier%100)/10));
  if ( A % 2 =0 )
  printf("votre resultat est: %d " , A*A);
  else
  printf(sqrt(A));

    return 0;
}

==

if (A%2 == 0)

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