my teacher gave a math riddle i have exactly 3 factors the number before and after me is divisible by 2 (not prime)

Question

my teacher gave a math riddle

i have exactly 3 factors
the number before and after me is divisible by 2 (not prime)
i am a factor of 100
what am i

please help this is due first thing in the morning

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Answers ( No )

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    2021-11-23T22:27:55+00:00

    The factors of 100 = 1, 2, 4, 5, 10, 20, 25, 50, 100

    1 has only 1 factor (1 itself)
    2,5 is prime and has 2 factors each
    10 has 4 factors (1,2,5,10)
    20 has 6 factors (1,2,4,5,10,20)
    25 has 3 factors (1,5,25)
    50 has 6 factors (1,2,5,10,25,50)

    The answer is 25

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