A ____________ number has only two factors

Fill in the blanks:

1.    The smallest ___________ of any number is always itself.

2.    A ____________ number has only two factors.

3.    16, 25 and 100 are all _____________ numbers.

4.    The  __________ of 26 are 2 and 13.

5.    Dividing 49 by 3 will give 1 as a ______________.

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