No, it is a Prime number.
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All but 31 and 37 are composite.
Only 63 is a composite. 63 = 3 x 3 x 7 The other three numbers (13, 31, 61) are all prime numbers.
All of them except for 31, 37, 41, 43 and 47 which are prime numbers.
31,37 are not composite
A composite number is a number with more than two positive integer factors (itself and one). Other than these two numbers, the positive integer factors of 155 are 5 and 31.