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10 prisoners

Only the cells were visited with odd number times,can the prisoners escaped.Locked cells are named from 1 to 100.The times that a cell been visited is equals to how many factors its corresponding number have.Every single number except 1 should have at least 2 factors,include 1 and the particular number itself,others should be geminations,When the gemeled number is the same one,the number of factors of this cell number is odd number.Means the prisoners in this kind of cells would escape.These numbers are 1,4(2*2),9(3*3),16(4*4),25(5*5),36(6*6),49(7*7),64(8*8),81(9*9),100(10*10).

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