Answer:
2
Step-by-step explanation:
A prime number is a number that has two factors, 1 and itself.
The factors of the numbers are given below:
• 2 = 1, 2
• 4 = 1, 2, 4
• 1 =1
• 9 =1, 3, 9
We conclude that 2 is a prime number.
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