What is the stiffness coefficient after the spring with stiffness coefficient K is divided into two equal parts and paralleled

If the spring with stiffness coefficient K is divided into two equal parts and the same force F is applied to the original spring, the elongation can only reach half of the original value, from k = f / X
After being divided into two equal parts, the stiffness coefficient K1 of one part is f / 0.5x = 2K
After parallel connection, apply force F, each force is f / 2, and the elongation is 0.25x
So when the spring with stiffness coefficient K is divided into two equal parts and paralleled, the stiffness coefficient is K2 = f / 0.25x = 4K

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