Playing With Numbers- Crossword

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123456
Across
  1. 3. Brackets, Of, Division, Multiplication, Addition, Subtraction
  2. 5. 3 consecutive prime numbers differing by 2
  3. 6. Prime numbers having a difference of 2
Down
  1. 1. Numbers having only 1 as the common factor
  2. 2. A number having more than 2 factors
  3. 4. The sum of the factors is twice the number
  4. 5. A number has only two factors- 1 and itself.