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Square numbers, like 49, have an odd number of factors.
No - prime numbers are numbers that can only be divided by 1 and itself. 25 and 49 are examples of perfect squares 5*5 = 25 and 7*7=49
1 x 49 = 49 7 x 7 = 49
1, 7, 49.
Three: 1 7 49.