No. This is not for sure an Autism problem.
Autism, which affects thought, perception and attention, is not just one disorder with a well defined set of symptoms; autism is a broad spectrum of disorders that ranges from mild to severe. In addition, the behavior usually occurs across many different situations and is consistently inappropriate for their age.

In the diagnostic manual used to classify disabilities, the DSM-IV (American Psychiatric Association, 1994), “autistic disorder” is listed as a category under the heading of “Pervasive Developmental Disorders.” A diagnosis of autistic disorder is made when an individual displays 6 or more of 12 symptoms listed across three major areas: social interaction, communication, and behavior. When children display similar behaviors but do not meet the criteria for autistic disorder, they may receive a diagnosis of Pervasive Developmental Disorder-NOS (PDD not otherwise specified).

For more details please refer to link below:
http://www.autism-pdd.net/checklist.html