static boolean isPowerful ( int n ) {
  while ( n % 2 == 0 ) {
    int power = 0 ;
    while ( n % 2 == 0 ) {
      n /= 2 ;
      power ++ ;
    }
    if ( power == 1 ) return false ;
  }
  for ( int factor = 3 ;
  factor <= Math . sqrt ( n ) ;
  factor += 2 ) {
    int power = 0 ;
    while ( n % factor == 0 ) {
      n = n / factor ;
      power ++ ;
    }
    if ( power == 1 ) return false ;
  }
  return ( n == 1 ) ;
}

static boolean isPowerful ( int n ) { while ( n % 2 == 0 ) { int power = 0 ; while ( n % 2 == 0 ) { n /= 2 ; power ++ ; } if ( power == 1 ) return false ; } for ( int factor = 3 ; factor <= Math . sqrt ( n ) ; factor += 2 ) { int power = 0 ; while ( n % factor == 0 ) { n = n / factor ; power ++ ; } if ( power == 1 ) return false ; } return ( n == 1 ) ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (false))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) update: (assignment_expression left: (identifier) right: (decimal_integer_literal)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (false))))) (return_statement (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))