Number System

1234567
Across
  1. 3. A NATURAL NUMBER HAVING ONLY TWO FACTORS
  2. 4. A NUMBER HAVING TERMINATING DECIMAL EXPANSION
  3. 7. ALL COUNTING NUMBERS TOGETHER WITH ZERO
Down
  1. 1. SMALLEST COMPOSITE NUMBER
  2. 2. THE SET OF RATIONAL NUMBERS TOGETHER WITH THE SET OF IRRATIONAL NUMBERS
  3. 5. SMALLEST PRIME NUMBER
  4. 6. A NUMBER WHICH IS NEITHER PRIME NOR COMPOSITE