Which number is a palindrome 645 or 606?

How many nouns are in the following sentence Tanya ran and jumped quickly.? What two prime numbers equal 36? How old are you if you were born february 17 1992? What piece of science equipment is used for measuring mass? How do you write 1.9 billion? What is 10000 plus 100000000? How many curved sides does a hexagon have? Why it might be imporatant to limit yourself to explaining only the top two or three reasons for the position you hold? How much fortnights is in a year? Who said insanity and genius are two sides of the same coin? Why propeller blades are given a geometric twist from root to tip? What goes into 525 and 1000 evenly? How many hrs is 6.30 to 3.00? What is a midpoint of a graph? What is the value of a US 10 dollar bill with missing serial numbers? How do you write 44 over 25 in a decimal? What is the length of the notecard in meter? What is six feet in decimals? What is the factors of one thousand? How many syllables does trailer have?