Discussion

Explanation:

In the first 200 odd natural numbers the lowest is 1 and the highest is (2 × 200 - 1 =) 399.

All the natural numbers that have an odd number of factors are perfect squares and vice versa. 

Out of the first 200 odd natural numbers, there are 10 perfect squares i.e., 12, 32, 52, ..., 192
[19 is the 10th odd natural number]

Hence, there are 200 – 10 = 190 numbers among the first 200 odd natural numbers that have an even number of factors.

Hence, 190.

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