Numbers

12345678
Across
  1. 1. one letter away from something bad
  2. 3. last one digit number
  3. 4. 2²
  4. 5. first two digit number
  5. 6. when squared, it staye the same
  6. 7. contains like 2 silent letters
Down
  1. 1. _____ eleven
  2. 2. the true first number
  3. 4. the first prime where its made of primes
  4. 5. the first odd prime number
  5. 8. the only even prime number