Square and Square Roots

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Across
  1. 2. A way of expressing a number as a product of its prime factors
  2. 5. A factor of a number that, when multiplied by itself, gives the original number
Down
  1. 1. Numbers whose dot patterns can be arranged as triangles
  2. 3. A number which is a square of a natural number
  3. 4. The product obtained by multiplying a number by itself