Possible Clues:

• Number such as two, three, five, seven, etc
• Most fundamental
• Chief or most important, like a minister
• 7 or 11
• Type of time or minister
• This number is!
• Numbers like 3,7,11 or 13
• Fundamental - of highest quality
• (Of number) divisible only by itself and one
• The best time of one's life is brief