It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 155 109 is not a prime number.
For example, 155 109 can be divided by 3: 155 109 / 3 = 51 703.
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For 155 109 to be a prime number, it would have been required that 155 109 has only two divisors, i.e., itself and 1.
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155 109 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 155 109 is about 393.839.
Thus, the square root of 155 109 is not an integer, and therefore 155 109 is not a square number.
The square of a number (here 155 109) is the result of the product of this number (155 109) by itself (i.e., 155 109 × 155 109); the square of 155 109 is sometimes called "raising 155 109 to the power 2", or "155 109 squared".
The square of 155 109 is 24 058 801 881 because 155 109 × 155 109 = 155 1092 = 24 058 801 881.
As a consequence, 155 109 is the square root of 24 058 801 881.
The multiples of 155 109 are all integers evenly divisible by 155 109, that is all numbers such that the remainder of the division by 155 109 is zero. There are infinitely many multiples of 155 109. The smallest multiples of 155 109 are: