Enigma 1425: Spell check
From New Scientist #2586, 13th January 2007
In the following statements and questions each digit has consistently been replaced by a capital letter, with different letters used for different digits.
ONE, FOUR and NINE are perfect squares.
Also, more than one of the following statements is true:
EIGHT is even;
EIGHT + 1 is a perfect square;
EIGHT + ONE is a perfect square;
EIGHT – 1 is a prime;
EIGHT – ONE is a prime;
EIGHT + 7 is the product of two primes;
EIGHTEEN is divisible by 3;
EIGHTEEN is divisible by THREE;
EIGHTEEN – 2 is a perfect square.
What is the RIGHT number?