A good answer might be:

No. Any type of symbolic data can be represented using binary, not just numbers. At the electronic level, everything is a binary pattern (which some people call a "number"), so the statement is sort-of correct.

You may wish to review the following terms. Click on the hypertext phrase to go the the page where the term was discussed. To get back here, use the "back arrow" on your web browser.

• What "binary" means.
• What a "bit" is.
• The advantages of using binary in a computer.
• What "analog" means.
• How thresholds are used.
• The master clock of a computer.
• Memory contents as bit patterns.