Is this LEGO set rare because it only has one piece?

Yes, its low piece count (1 piece) combined with its 1998 release makes it a specific and potentially rare find for collectors.

What is the theme of this LEGO set?

The theme of this set is Soccer, specifically from the LEGO World Cup line.

The set number for this item is 880002-2.

Name: LEGO World Cup Dutch Starter Set (880002-2)
Brand: LEGO

Soccer

Soccer · 1998

Theme · SoccerPieces · 1Set Number · 880002-2Year · 1998

Used

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New / Sealed

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Is this LEGO set rare because it only has one piece?: Yes, its low piece count (1 piece) combined with its 1998 release makes it a specific and potentially rare find for collectors.
What is the theme of this LEGO set?: The theme of this set is Soccer, specifically from the LEGO World Cup line.
What is the set number for the LEGO World Cup Dutch Starter Set?: The set number for this item is 880002-2.